Instead of calling dibs it can be done maybe alphabetical by character or user maybe.
I have a long list of oc's:
LBT oc's: Mim, Mia, Deon, Rhyn. I've done some other characters but they only appeared once or just in 1 rp.
----
Insane Cafe: Jason, Sara, Moran, Odysseus. In past chapters I've had Mim be a companion of Jason, and later with her own tardis with a yoshi and a charizard as companions, forgot their names, & Hoopy. Hoopy the yellowbelly has been a companion of Jason's also.
Also seen brielfly were Markus Darkwood, Douglas Brown, also.
-----
Kravik and Sivar, used briefly. Don't recall the names of the others I've done briefly on here in the past.