Super Saiyan 3 has been used by Gotenks, but the form was unstable and short-lived. Neither Fusion Dance nor Potara Fusion can sustain Super Saiyan 3 for long due to the immense power output.
In previous games like Dragon Ball FighterZ and ... are playable as well. Another fusion character from Dragon Ball Super, Fused Zamasu, was confirmed to be playable in his normal and Half ...