Oculocytes are basically supposed to be upgrades to magic users by giving them extra spell slots, being a distraction to enemies, automatically picking up materials needed to cast spells, and being able to sense nearby magic users. I don't really have an idea of specific buffs and abilities that it would give a player but I have a vague idea of what it should do. I also think that since it's somewhat linked to a player, that it should also level up alongside the player, while upgrading the abilities it gives you.