at first i was like nah at this idea, but the more i think on it the more I like it.Have it be a rival - the first one's sister, or similar. And you can drop hints about the first one in its dialogue. Then, later on, you can re-introduce the first one as an adversary to the adversary. It's often fun to show the PCs that they aren't the only ones with an agenda.
like two rakshasas (Rakshasi?) who just for the fun of it manipulate or replace leaders and make each attack each other with troops and see who wins. and this has happened multiple times over the centuries with rakshasa's rebirth and multiple lifespans. Feeling like they play chess, but with people.