Lets look at Biaka AS, for example unless she is put as single character at the front she can’t be called tank, as she doesn’t offer rage to draw single attacks to her.
I feel that the current exemplification and maybe even the definition isn’t proper at the moment.
I suggest as well, that „team role“ becomes a character attribute. With that all proper roles like dps, tank, healer, support - and whatever I might have left out can be easily assigned and can be properly filtered if needed.