So this is for a DBZ game. I already made a fusion script, everything works and the animations. But what I'm having trouble with is combining 2 players and giving controls to only 1. I already looked at this and it doesn't really help me http://wiki.roblox.com/index.php/Controlling_a_Player's_Character
What you could try doing is removing one player's character and changing that user's CameraInstance's CameraSubject to the original user's Humanoid. It's a bit complicated, so I won't put it here.
Have you tried welding the 2 together and revoking the controls from one player? and the downvote might be down to the actual concept, or just a troll.