Submitting Marius Calla, cleric of Shelyn, for your consideration.
Looks like his concept ended up a bit like Mirela, though I think they do diverge both in combat style and overall feel. A former Lamb escapes, becomes a cleric of some sort, decides to return to put an end to Lamm's depravity. It would be possible that the two might have even met at some point!
To echo Mirela's statement above, would it make more sense for Marius to have been quietly moved out of the city after escape? As it is I have him mostly staing with the Sanctuary of Shelyn with the occasional trip elsewhere, but I'm not sure just how far-reaching Lamm's tendrils are in Korvosa, and how likely it would be for one of his escaped Lambs to go unnoticed or otherwise unmolested while remaining in the city. If it makes more sense for him to leave the city, I don't mind changing it.
Thanks.