KoopalingsLarry Koopa: Like the other Koopalings, Larry has shown the ability to generate magic blasts and spit fireballs, as well as walk, run, jump and spin inside of his shell. He is usually the weakest of the group due to him being faced in battle before the others in most games. However, on some occasions he is actually the last to be fought and his abilities are altered accordingly. In New Super Mario Bros. Wii the only magic he can perform with his wand is to make a low heated blue fire ball. Unlike the other Koopalings, Larry doesn't show any signs of improvisation, as he keeps his battle tactics mostly the same when the player fights him the second time (neither has he ever used Warp Pipes in his battles, unlike his siblings). In Mario & Luigi: Superstar Saga he has the same stats as Iggy and uses the same technique of spinning around at extreme speeds in order to make his foes dizzy. He is unique in that he uses a tennis racket to spar with the Mario Bros. before the actual battle, and uses the same racket during the battle to send back some of his fireballs intercepted by the Bros. hammers. He is also capable of utilizing poison and burn status effects as a deterrent against Bros. Attacks. In Hotel Mario, he uses a bowling ball against them. In New Super Mario Bros. 2, he fires energy blasts at Mario that ricochet against obstacles, similar to Wendy's rings. He also used water geysers to his advantage in his battle in New Super Mario Bros. U. In Super Mario World, Larry shares Iggy's tactics against the Mario Bros. by throwing balls at them that he keeps in his shell. However, he also raises the stakes by having Podoboos periodically jump up, and flings balls at a faster frequency than Iggy. In addition, Larry seems to have higher strength than an average person (though not superhuman), and he has superhuman durability, being dunked into lava and survived Mario destroying his castle while he was still in the lava in Super Mario World, for example.
Sprites from Super Princess Peach relating to his planned appearance implied that he would have utilized his spin attack once again against Peach. Similarly, it would have been implied that his Vibe-state during what would have been the second half would have been "Calm."
Morton Koopa Jr.: Morton usually uses his weight to try and crush Mario or paralyze him by shaking the ground, as in Mario & Luigi: Superstar Saga and Super Mario World, which even involved him running up the walls and dropping down from the ceiling. His debut appearance in Super Mario Bros. 3 did not involve his earthquake-causing power, however, and he relied on the standard abilities shared with his siblings to fight, such as jumping and shooting magic blasts, although he generally doesn't use his magical abilities as much as his siblings. In New Super Mario Bros. Wii, he tended to use his magic wand once his enemies were already immobile, and the game also showed that he couldn't actually jump very high, unlike earlier depictions. He also has the ability to shoot spiked balls from his wand, as shown in New Super Mario Bros. 2. In New Super Mario Bros. U, he has a magic hammer that he uses to knock giant Pokey segments at the player. Like the other Koopalings, Morton can breathe fire, and in Mario & Luigi: Superstar Saga, he used some sort of sonic screech against the Mario Bros., which is like Bowser Jr.'s Sonic Roar! Super Ability from Mario Strikers Charged. His bio on the Japanese New Super Mario Bros. Wii website also implies that Morton's strength is dependent on his weapon.
Despite his strengths, his size also resulted in him being unable to get up once he is forced onto his back, as evidenced by the ending for New Super Mario Bros. 2, where he ended up on his back as a result of the Koopa Clown Car crashing.
Sprites relating to his planned appearance in Super Princess Peach implied that he would have inflated himself like a balloon at some point during the battle, as well as spit objects out and charge at her.
Wendy O. Koopa: Wendy has displayed some unique abilities throughout her appearances as a boss character. In Super Mario Bros. 3 and New Super Mario Bros. Wii, Wendy uses her wand to create up to three glowing rings that float around colliding with each other and the environment. The rings can glide through water as well, although at lower speeds, and over time they dissipate. In Mario & Luigi: Superstar Saga, she didn't have to use her wand to create rings that would close in on the Mario bros. once they appear beneath them. This game also had Wendy breathing fireballs and creating Spinys disguised as clones of herself, an ability shared with Lemmy and reminiscent of how they used similar-looking "dolls" to confuse Mario in Super Mario World. Wendy is shown running and jumping in Super Mario Bros. 3 and New Super Mario Bros. Wii, and the later also showed her spinning inside of her shell for offensive and defensive purposes. New Super Mario Bros. 2 also showed her as being an adept swimmer. New Super Mario Bros. U also depicts her as being skilled at ice-skating. In the same game, she also seems to throw her ring bracelets and have them richochet against walls, hinting that they were candy rings. In addition, like Bowser and the other Koopalings, she has superhuman durability, surviving near-death situations, such as being dunked into lava (and later having her castle being collapsed on top of her in Super Mario World, her surviving her being blasted with a fire flower in Mario is Missing, her surviving being crushed by Bowser's castle in New Super Mario Bros. Wii, and her surviving being knocked into a lava pit by a newly-gargantuan Bowser in New Super Mario Bros. 2
Iggy Koopa: Iggy is the fastest of the Koopalings. Iggy rides a Chain Chomp in his boss battle in New Super Mario Bros. Wii and New Super Mario Bros. 2, utilizing a custom track. He could spin as a top in Mario & Luigi: Superstar Saga and even move fast enough to make his opponents dizzy. Like all the Koopalings in that game, he can also spit fireballs. As shown in New Super Mario Bros Wii, his magic blasts are the most chaotic out of all the Koopalings. In Hotel Mario he could cause small amounts of lightning to rain down on Mario. In addition, his unused sprites in Super Princess Peach show that the Koopaling was to use his hair as a spear. He also can throw balls at the Mario Bros. during their fight with him in Super Mario World, which he keeps in his shell. As demonstrated in New Super Mario Bros. U, Iggy has the ability to make lava rise from the ground and fire at least two varieties of spells: One being his normal chaotic green spell, and the other being red orbs that upon making contact with lava will summon Magmaargs. In addition, his energetic nature even allows him to stand on ceilings, as evidenced by his boss fight in New Super Mario Bros. U.
Roy Koopa: Roy is one of the strongest Koopalings. He has the ability to jump high into the air and use Ground Pounds to cause powerful tremors, capable of stunning (or even crushing) the Mario Bros. He can also climb up vertical walls and drop down from the ceiling to create tremors. He can also use his wand to shoot magic blasts or purple fireballs at his opponents. He is also shown to be strong enough to wield a huge bullet bill blaster with only one hand. In Hotel Mario, he uses his brawn by extending his arms to punch at Mario. Like the others, Roy is capable of spitting fireballs and spin around while inside his shell. His unused sprites in Super Princess Peach suggest he was going throw spiked-balls and use a full body tackle for attacking. The latter concept was revived for New Super Mario Bros. 2. In Mario is Missing, Roy bragged that the only thing capable of destroying him was fire. Despite this, however, he was shown surviving alongside the other Koopalings being knocked into a lava pit by Bowser in New Super Mario Bros. 2.
Lemmy Koopa: Lemmy seems to prefer using circus balls when combating his enemies. He often fights atop his ball and if his boss area has icy floors or a conveyor belt, he will use them to his advantage by trying to slide his opponents right off the edges. In Super Mario Bros. 3, New Super Mario Bros. Wii and New Super Mario Bros. 2, Lemmy utilizes his magic wand to generate rubber circus balls, in numbers up to three (even more in his New Super Mario Bros. Wii rematch), creating great difficulty for the Mario bros. He also utilized various dummies as decoys when fighting Mario in Super Mario World. In Mario & Luigi: Superstar Saga he would spin like a top like Iggy, and he could also summon Goombas disguised as clones of himself, just like Wendy. In addition, in a similar manner to Super Mario World, he also attempted in Mario & Luigi: Superstar Saga to confuse the Mario Bros. by splitting into copies prior to fighting them. Other than that, his abilities seem normal compared to his siblings, as he is seen walking and jumping in his Super Princess Peach sprites, and breathing fireballs in his appearance in Mario & Luigi: Superstar Saga, as well as spinning inside his shell for offensive and defensive purposes in New Super Mario Bros. Wii. In New Super Mario Bros. U, he also threw star-patterned bombs that bounce on the floor and once touched by Mario, a short fuse is activated that will cause the bombs to explode after a few seconds. Lemmy has enhanced balance and acrobatics supported New Super Mario Bros Wii and New Super Mario Bros 2 by being able to maintaining his balance on a ball while on an icy floor and conveyer belt as well as performing a handstand on the ball upon the said floors before preceding to battle. He's also implied to be quite strong especially for someone his size in New Super Mario Bros. U, due to him throwing several large bombs at Mario with minimum effort.
Ludwig von Koopa: Ludwig is usually portrayed as the most talented and powerful of the Koopalings. In Super Mario Bros. 3, Ludwig shared his attack pattern with Roy; Ludwig could fire projectiles from his magic wand, pound the ground to stun the Mario Bros., and retreat in his shell for both defensive and offensive purposes. Although all the Koopalings in Super Mario Bros 3 frequently retreated into their shells when stomped on by the Mario Bros. Ludwig was the only one of the Koopalings to demonstrate doing so at will, without having to be hit by the Mario Bros. He was given a completely unique attack pattern in Super Mario World, which none of the other Koopalings shared; Ludwig could spit three fireballs in a row (thus making him the first Koopaling to have learned the ability to breath fire) and spin around the room in his shell, after which he could perform a long jump to the other side of the room. Ludwig was given even more new powers in Hotel Mario: he can fire electricity from his hands and teleport in a flash of lightning. In Superstar Saga, Ludwig retained his previous abilities of breathing fire (though not as furiously as the previous time) and spinning around in his shell, but also learned the new ability of spinning like a tornado to attack the Mario Bros., which was also done by Iggy.
In New Super Mario Bros. Wii, Ludwig learned even more new abilities. He can either blast four fireballs from his wand at time or fire a single fireball with circling capabilities, and has even mastered the ability of Flutter Jumping, being able to stay in the air for several seconds. His appearance in New Super Mario Bros. 2 has him also expanding on these abilities, utilizing the Flutter Jump to grab a chain, and then move between the two, and in addition, he can also increase his rate of fire. In New Super Mario Bros. U, similar to Lemmy and Wendy in Mario and Luigi: Superstar Saga, he was also revealed to create fake duplicates to fake out the Mario Bros. He is also shown with the ability to levitate without needing to Flutter Jump. He's also proven to be more acrobatic than most of the other Koopalings being able to jump large horizontal distance with several flips in Super Mario World. While his appearance in Mario Kart 8 doesn't show his abilities, it is shown he can do a double-flip in the air while performing a stunt. Most of his tricks involve him jumping out of his kart, something he does more than any other characters meaning. Super Smash Bros. for Nintendo 3DS / Wii U has Ludwig in his own version of the Koopa Clown Car, as he is a "palette swap" of Bowser Jr., just like the other Koopalings. He can shoot cannonballs, use drills, boxing gloves, wrecking balls, and can even jump out of his Clown Car.