I hope Oda goes all out for the crew this arc. Robin already had a great moment, but being freed then helping protect the library would fit. She may not be strong enough to beat a Holy Knight, but she'd be great in tandem with other crew members. Franky probably won't get as much character focus, but Oda usually has him come in clutch when the fighting happens, he'll be essential and get some nice feats. Brook also looks like he'll be pivotal in how things go with Gunko, but I hope he gets some showings before then.
Usopp needs as much attention as Oda can spare. His idols were turned into demons, time to get serious, overcome some nightmares and help Elbaph. I imagine he'll probably be paired with some of Hajrudin's crew when he get released. Nami and him make a good team, so her there also supporting and showing off what she can do with Zeus.
Jimbei's strong so I imagine he'll just run through a bunch of nightmares then be one of the main forces if that group faces a Holy Knight. Helping by putting out the fire in the library makes sense (more firefighter duty but better than nothing) and helping out against a Holy Knight.
The Monster Trio will be fine of course, then that leaves Chopper. Treating Gaban is good, I wonder if he joins an important battle after.