These books have major m/m ♥_♥, a QPOC, as well as several significant female characters (Exy is co-ed). Neil is the protagonist, so I can't exactly say it's an ensemble cast, and yet all the team members have great characterisation and their interactions are rich in nuances that reveal themselves little by little.
I've seen this series recommended to Captive Prince readers on multiple occasions and it's definitely as intense and as addictive! It can also be very violent, but in a way that worked for me, unlike the first CP novel. I love these books so much and I'm going to miss them a lot, but now I have almost 1000(!) All for the Game fanfics waiting for me on AO3. :D