Well, being that Cell would top off after 2 transformations, I would think that giving him the Blue Cell Kids for a buddy transformation, or an attack would be good. However, he is already overbalanced, so this is my proposal.
Have the "Spawn of Cell" as an attack. Each One would have 2/3 the PL of Cell and about 40 hp? Then they wouldn't be able to melee, (or if it's possible they could), and would be more prone to the special beams when they did fire, (IE: Kame, Galit, SBC). But as for Cell you Character, you would be vulnerable,
You wouldn't be able to move or you would move as fast as having the disk out. (And maybe the Blue Cell could take away PL from the original Character)
Hmm this is a working idea so spill out some stuff..
Have the "Spawn of Cell" as an attack. Each One would have 2/3 the PL of Cell and about 40 hp? Then they wouldn't be able to melee, (or if it's possible they could), and would be more prone to the special beams when they did fire, (IE: Kame, Galit, SBC). But as for Cell you Character, you would be vulnerable,
You wouldn't be able to move or you would move as fast as having the disk out. (And maybe the Blue Cell could take away PL from the original Character)
Hmm this is a working idea so spill out some stuff..