I would like to make a character that is rebellious against the crown in nature, but doesn't entire fit into either the Veiled Ones or the Ouroborros. Could I make a character that has mild ties to the two rebellious factions (or just the Ouroborros if both wouldn't work) but is not necessarily a member?

Or actually...now that I'm looking at it, what if my character was a member of the vanguard but worked as an informant to the Ouroborros, but wasn't a full-fledged member? Is that feasible?