Masachika's such a cute girl, who wouldn't want her in the gang? She's even joining the school trip to help them!
Joke's aside, the 4 of them make a good team. Ibuki would be of course the one trying to directly investigate everyone, Sumihiko's smarts make him the mastermind, Masachika would be the one with connections to the Jingu ganga, and Togeya would be the one of course being the direct bodyguard of Akabane.
I personally don't suspect anyone yet, we have way too little information on everyone.
Those two sub-leaders were pretty intimidating. Ogami's a thrillseeker, Yugen's a cult leader. That's a very common thing in many gangs nowadays. It'd be terrifying if any of them became the leader of the Jingu Gang.
That Delinquent High School's gonna prove to be a huge problem for everyone though. They're definitely gonna make Akabane stress out, since they're all about Chaos, while she's Order incarnate! So Ibuki's obviously gonna make it his mission they never have to interact.
Stupid question, but who's Ogami again?
Ogami's the first enemy introduced here.