I don't think colours been used to distinguish staff is that important because if users want to know who the staff are, this is the best place to know it: https://animeforums.net/staff/. I think that link needs to be more accessible on the navigation bar.
But moving on, I think colours can be used in a specific way to distinguish staff and give the users some colour options to customise their profile with. For example a setup like this can be used:-
Admins- Red Name
Mods- Cyan Name
Users will have Orange, Green and Violet names to choose from. These colours can be shop items, could be a trophy prize or could be given by default.
Anyone who is a frequent user to the forum will know that red and cyan names are staff and the rest of the colour names are normal users.