I finally figured out who Rachel Morgan reminds me of ...

This chick, right here!   VICKI NELSON from Blood Ties, ya'll!!!

1. They both own and operate a private detective firm runner business
2. They both have demon marks that they are ashamed of but earned fighting for truth justice and the goody-goody way
3. They are both spunky tough girls with hearts of gold
4. They both have wacky side-kicks who do leg work for them (Coreen and Jenks)
5. Mike is like a stand in for every one of Rachel's ill-fated boyfriends.  They try so hard but are destined for failure.
5. Rachel had a childhood sickness and Vicki has glasses. It humanizes them, ya'll! They're just like you and me!
7. They both use bravery as an excuse for doing exceedingly stupid things.
8. And they both have brooding vampire love interests who they are clearly meant to be with, but fight for some inexplicable reason! Only, Vicki might be more ridiculous in this case, cause she doesn't even have a vamp-scar or gay!panic to blame.  Then again, Vicki is also far less of a c-tease than Rachel is, so Henry suffers less. 

( conclusive visual evidence behind the cut ... )

Ah, I feel so much better now that I've figured it out :D