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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Grav Gun spree! Freeman uses the GRAV GUN to lock his enemy into position and beat the SH!t out of him. Glass The Prophet (Any of the 3) Summons a pillar of fire in which he can move direct around the map. Dual Wield Sword Frenzy! Arbiter pulls out second sword and gets 2x percentage attack bonus.