I'm currently planning a Misfits-style game built in Kerberos-club Fate. Basically a bunch of young offenders with super powers.
One of the players is thinking of a character whose power is that he splits into 2 different characters. They look exactly the same, but have very different personalities. This is directly taken from a character in the show (Rudy, series 3 and onwards), and in the show, it works very well. There's a clear distinction between the characters, and it leads to a lot of great conflict and narrative.
The issue is that I'm not sure it will translate well to Fate. Mechanically it's fine, Kerberos Club actually has a specific "Duplicate" mechanic. I'm just worried about the difficulties in having the player take part in a narrative without confusing people, considering that Fate is very RP-heavy. Is there a way to make it easier without sacrificing story, or might it be a bit much for a Fate game?