Fusing with another player of the same race should be a deeply advanced skill, which can only be learned by the masters themselves and requires massive skill to post the training session of. This is fusion. Another player who have learned the arts can fuse with another player (This uses up the post of both users). They will become the same, and each player will switch control of it for each post until the end of the thread. Both PLs are doubled before multiipliers are appealed, so...
Okay, I make ti sound advanced. But wouldn't fusing be AWESOME?