[FairyKing]

I think if they did a fusion anniversary rider, instead of fusing multiple riders together (although that would mean fewer forms, which could be good as it would let each one shine more), it could be neat if they had collectables that could mix-and-match with different combinations creating different riders. For example:

Monster + Sweet = Gavv
Sweet + Warrior = Gaim
Buddy + Monster = Revice

Although personally I dislike the whole "using the powers of past heroes" thing in general