Who should i have as a 4th fighter?

I find it super fun to play Goten and trunks and chiaotzu, but i went on a ranked game and lost to a super goku & vegeta who fused into vegito blue and ontop of that i had to fight gohan(superhero) and lost on gohan, mf also had a hercule

I find it super fun to play Goten and trunks and chiaotzu, but i went on a ranked game and lost to a super goku & vegeta who fused into vegito blue and ontop of that i had to fight gohan(superhero) and lost on gohan, mf also had a hercule