Besides the ones that appear in the Super Smash Bros. games.
I'm thinking Master Chief calling in a MAC round; or Commander Shepard calling in the Mako or Hammerhead.
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Edited by KingKrown: 7/3/2014 8:11:01 AMMaster Chief(Bungie) "Spartan-II Barrage" - hands you your ass, hand to hand,then with a knife and sword,then quickly with UNSC weapons,uppercuts you, smashes you down,pulls out a Spartan Laser, blast you,Mewto/Lucaro style. Mustard Chef(343i) - "Cortana" Yells Cortana,falls to his knees. inflicts 300% damage on him and his humanity. WonderRed (Wonderful101) - WonderFist, him and his friends assemble and Giga Flamming punch the sh*t out of you.