New game is introducing EX-fusions which uses so-called "Metamo-Ring", made by Capsule Corporation, that compensate any difference between characters. Which is why they can fuse even Satan and Buu. So you can really fuse anyone with anybody.
Dragon Ball Fusions
Hunter Morris
Adrian Brooks
By the way "Metamo-Ring" is that orange-black thing on characters left arms in OP picture.
Eli Green
this isn't a canon video game. there's some type of ring that lets ANYONE fuse regardless of race,size, power level,etc.
see
Grayson Brown
Broly and Gogeta.
Bentley Butler
Bulma x Chi-Chi fusion is simply necessity.
Colton Bell
Pandel a cute
Angel Price
>Goku calls that flat chested
High standards he has.
Ian Sullivan
Omniking and Roshi
Dominic Mitchell
Chi-Chi is stacked. What is goku retarded?
Easton Hughes
>is Goku retarded?
Well. He is.