In FFTPatcher, I activated the weapon armor etc. box in the Mime class. Also i give it a new skill set. But in-game i can´t wear Items and don´t edit the skills like in Final Fantasy Vanilla.
Mime's are "hardcoded" in alot of areas by the original code. There's an ASM hack that fixes different parts of it in JoT5.. and I think a version of it is in FDC's Hack thread.. can't remember though.