Z Item which helps
Did anyone know that the Z item 'Kiss of 18' increases the character's level from 8 to 40, increases them by 32 lvs!!! Ways to get the 'Kiss of 18':
Unlock all tournaments and do them on all difficuilties
Go to Shenron for the first time
Go to Shenron for the 5th time (Sometimes works, swear down)
Go to Porunga for the 10th time (Sometimes works, seriously swear down!)
Hope I helped for the crap and good characters!!