I don't have to tell you who Kirby is, he's already in the game. But what I will tell you is about Fighter Kirby, which is a copy ability Kirby gets from swallowing Knuckle Joe in most games, and Boxin (a punching dog-like enemy) in others. Fighter Kirby wears a red headband similar to that of Ryu from the street fighter series. In addition to that, a lot of Fighter Kirby's moves seem to reference Ryu, but putting him in crusade wouldn't necessarily make him a smaller clone of Ryu, and here's why.
(Note, most attack names come from Kirby Triple Deluxe) (Note #2: I had to make up a couple things or borrow from other abilities in order to make this work, please don't call me out on it)
Jab: Vulcan Punch (This would be similar to regular Kirby's Jab considering this is where it comes from)
S-Smash: Smash Punch (Kirby charges up and throws a punch with the medium range of a projectile)
Dash: Leg Sweep (Kirby rises off the ground into a spinning kick motion, similar to Ryu's Tatsumakisenpuyaka)
U-Smash: Rising Break (Kirby Charges up an uppercut that is similar to Ryu's Shoryuken)
D-Smash: Giga Force Blast (Kirby charges up a huge fireball attack, you can probably guess what it's similar to)
D-Tilt: Slide Kick (Kirby's sliding kick he does in every Kirby game. Ever)
U-Tilt: Uppercut Kick (The kicking uppercut that used to be Kirby's dash attack with Fighter)
S-Tilt: Foe Grab + Arm Throw (Can grab the opponents and throw them forwards)
Bair: Double Kick (Kirby kicks backwards and has a medium projectile range)
Dair: Sky Kick (Yes it is actually in Kirby games, but it's just Sonic's Dair basically)
Fair: Forward Double Kick: (Just a reversed Double Kick)
Uair: Down Kick (A flip kick upwards. I did not make this up)
Nair: Moon Somersault Kick (To quote the Kirby Wiki: Kirby performs a Somersault Kick in midair, damaging enemies. This kick renders him invincible for the duration of the move and leaves behind a crescent shaped flash.)
N-Special: Force Blast (Just a weak fireball projectile)
U-Special: Hi-Jump (Comes from the Hi-Jump ability and is exactly what it sounds like)
S-Special Metal Roll (Comes from the Metal Ability, Kirby turns metal rolls around a short distance to cause damage)
D-Special: Needle (Comes from Needle ability, Kirby becomes a spike ball similar to the Unira item. Can stick to walls)
Grapple: Throw Ability (From *Take a wild guess* Kirby inhales and grabs an opponent in his range)
Pummel: Kirby's regular pummel
D-Throw: Kirby's Regular D-Throw
F-Throw: (From throw ability: He throws the enemy forward)
B-Throw: Judo Throw (Kirby Turns around and throws the opponent like a Judo Master)
U-Throw: Kirby's Standard U-Throw
Taunts: Kirbys Taunts
I hope you feel that this could be an Alt for Kirby like I do.