UPDATE:I have update with your ideas
They are adding characters and stages so there is no reason not to add new costumes.
Here are some ideas
-Maybe when DMC releases we can get some real alts for dante
-Polygon man's minions who you fight on the final battle, those costumes
-More Sackboy costumes
-I'm pretty sure Jak doesnt have his costume from Jak 2 so that would be good
Any other ideas?
-Ninja Fat Princess
-Sly's Cane Cole
-Vampire Evil Cole
-Toru but Koru=mind blown
-Spike's costume from Ape Escaoe that was released in America
-Alpha Big Daddy
-Lancer Big Daddy
-Drake needs to Suit Up!
Big Daddy: IDK
Nathen: James Bond type outfit
Sly: Pirate or Venice desguise from Sly 3
Raiden: MGS4 Raiden
Sweet Tooth: Human (Marcus Kane)
Kratos: Chef of war, bubbles, god armour, McKratos
Dante: No pants lmao
Parapa: Joe Chin
Toro: Kuro (when he does his level 1, Toro replaces kuro)
Cole: Sly's cane Cole
Evil Cole: Vampire cole
Sir Daniel: Human sir daniel? Naked skeleton?
Fat Princess: Ninja
Rachet: Secret agent clank and his choeffer (R&C 3)
Jak: Jak 2 PLEASE lol Did you know jaks undershirt in his jak 3 outfit is his Jak 2 outfit with the sleeves torn off?
Heihachi: a serious old hiehachi
Spike: ape escape 1 spike
Sackboy: Sackbot, Meanie, any of the cast of LBP2, Any sack version of any PS all star
did i miss anyone?
Maybe an new costume for Ratchet could be the Infernox armor from Ratchet & Clank: Up Your Arsenal. Here's what it looks like: