Much like the Willow/Kennedy relationship, I suspect the Robin/Faith relationship to be a transitional one. Kennedy is the step Willow needs to take to get past the death of Tara and start being open to living and loving again. Robin is the step Faith needed to take to realize she doesn't have to be a slut in a relationship all the time. To be fair, I think the only reason Robin had the chance to make the impact he did was because of the relationship/friendship Angel and Faith developed. She learned you could trust people and some people would make the effort to keep Faith's trust.
Longterm prospects though? I don't see Robin and Faith staying together.
Longterm prospects though? I don't see Robin and Faith staying together.