Rachel

Rachel is the first recruitable character that is optional and can be missed.To recruit her, you must challenge her and win.

At this point, she is incredibly strong and deals a lot of damage when compared to everyone else. But she leaves your party at the end of chapter 1, and will never join your party again.

Even though she is recruitable, she will appear most of the time outside your party, or fighting against you.

The game itself describes her as:

"Righteous demon. Very strong for no reason. Hates injustice and cowards."