My Clique in my just-finished game was myself + nine people: Ausdauer Mollers, Catherine Chard, Emilia Picotti, Emilia Strolin, Honors Plafox, Katja Quinnecht, Mairgrete Starkley, Neta Xemutre, and Silke Neiderstatter. I wanted Amada Kiffer, but she started her own Clique before I could get her. The only ones of those I specifically targeted were Emilia P (because permanent +3 charm is silly good), Neta (because permanent +1 charm is still good), Honors (because I took the Heroes parentage and needed a Stress minimum decrease), and Silke (+1 Fitness for free; not that great because fitness is easy to get, but didn't hurt). The others were end-of-the-year pickups who had never gotten a Clique; the relationship points were mostly gained through Perform: Voice actions that I was doing anyway for Merit and Glory.
Actually befriending them was pretty easy, namely because I abused the heck out of the Stress Bonus to get +4-8 to the later Befriend actions. It's easy to add 8 Stress to yourself to ensure an action works when you have 29 max Stress. And, because none of them are really bullies, they don't seem to have enough of a problem with each other to cause a schism. I used zero actions to get them to like each other.