This seems like a ridiculously fun party to explore with.
Given the limitations on races (technically none, but with a preferred max of 20 race points) I'm thinking either a Ghoran
(19 RP) Shabti
(13 RP) Sorceror might be fun to do. I'd probably go with the Hyperborean
bloodline regardless of race; since the party has a Bloodrager, I'd probably focus on protective and damage spells. Alternatively, I can focus on spells for combat control, with just a couple of damage spells mixed in.
If that doesn't work for the party... I'd probably go with a Human Wizard and focus on Item Creation feats. In the end, I'm fairly flexible in what I want to play, and I generally try not to step into the spotlight of other characters. If the others would prefer a Rogue or Cleric, I can do that, too.