Finn

Finn is an angel who is also an oracle for the god of the other world where all the non-humans live. In the story, she has basically been told to 'go to the human world and learn', and she is a total innocent who is incapable of acting on her own. Her main draw as a character is the way she attaches herself at the hip to the protagonist almost from the beginning and her generally straightforward and innocent reactions to anything and everything. Her path is a simple one, with a really obvious path to the ending. Her cuteness was great... but to be honest, I felt her path, like Kuroe's, was kind of lacking in depth.

Rea

Rea's path is... a classic example of what happens when people who aren't used to writing serious non-romance scenes try to write a bit of serious drama (the only serious drama/action I've seen so far in this VN). To be honest, it feels abrupt and forced... and it is obvious that the writer doesn't really have a strong image of what he wants to do here. It doesn't help that the actual antagonist is so ridiculous-looking that it is pretty much impossible to take what is going on seriously or emotionally attach to what is going on. As a path, the ichaicha part is about par for the course with Hook Soft's VNs in general, but the attempt at seriousness just doesn't go down right.

Edit: I should clarify that Rea's path is not all drama... it is mostly ichaicha (like all Hook soft paths), but the above description is how I felt about the experience with the drama at the end of the path.