Well, I'm not sure if anyone has proposed this one or not yet, but here's an idea for Goten and Trunks.
Have Goten and Trunks be one playable character. The model would be the two of them as kids. Fusion would be a weapon choice, and would last for say, 1 minute, but have a 5 minute "recharge" time. I'm unfortunately not familiar with coding for this game and I'm not sure how plausible this is though (such as the two smaller auras for them). Just an idea though.
Have Goten and Trunks be one playable character. The model would be the two of them as kids. Fusion would be a weapon choice, and would last for say, 1 minute, but have a 5 minute "recharge" time. I'm unfortunately not familiar with coding for this game and I'm not sure how plausible this is though (such as the two smaller auras for them). Just an idea though.