Thran
:: [ Magic: Dark (U) | Can mimic another character’s appearance and voice exactly, as well as their magic. ]
:: [ Restrictions | Can only remember three identities at a time, and must be within 5m of intended target to 'take' their identity. Using an identity removes it from his 'inventory'; lasts 2 posts in battle ]
Tavi
:: [ Magic: DarkxLight (U) | The ability to copy someone's magical ability by touch or being exposed to it ]
:: [ Restrictions | Can remember only the last 3 magical abilities at a time; in battle, she can only steal and use another magic once per post ]
So you'd have similar restrictions.