Though it seems like the benefits to Jo merging with Trickster far outweigh the costs, there's some added nastiness to forcing her soul to become hybridized with an Aspect zanpakuto. No, she doesn't gain some ultra-powerful unstoppable beast form nor does it make her go crazy or bipolar.
It does, however, make her rather uncomfortable in her own skin, and she often feels a bit pulled in loyalty. She also has the looming question of what can possibly happen to her, since she doesn't know anything about human/Aspect hybrids and what happens to them over time.
For clarification, the skull isn't a mask, it's actually her face
blah blah, anyway tell me what you think? XD