Miles "Tails" Prower

[Alpha Six]

Tails and mechs for Assist Trophy. The mech he chooses is random, so there could be any of these effects;

Plane - fly across the screen, dropping bombs that are probably about similar in effect to Link's bombs. If a player gets hit by the vehicle, they take damage.
Walker - Someone else come up with this, I haven't played Sonic Adventure 2 Battle in a long time. Probably the laser cannon, so it'd have an effect like Suicune.
Others - etc

and Knuckles for playable.