Gwen is a fighter. she's tough, has her own powers, and is independent (not fluffy or the whole about clothes as a #1 priority). She's like buffy w/ electrical powers.
I think that Gwen will be on more eps because i read somewhere that the writers "had high hopes for the new character Gwen, who is a cat-burgler for mystical items with a habit of getting struck by lightning".
I also liked Groo. I hope that he will come back.