There are many problems with Excellia. The biggest is that the concept of a "minotaur queen", as minotaurs are portrayed in CoC, is laughable. The entire concept of minotaurs is that they're a hypermasculine male-dominated race whose cum turns women into docile drug-addled slaves. Even if you go "lol demons did it", the notion that the minotaurs somehow have a female leader is the definition of making a special snowflake.
Even putting that aside...look, if I write an original character do not steal and then I use her in a goofy two-month D&D campaign with my friends, that's one thing. If I write that character and then cram her into a real game played by hundreds of people and that real people are paid actual money to develop, that's in poor taste to put it lightly. Even if Excellia was originally created for CoC, by the time implementation was being even considered she had diverged so far from those origins that she was effectively her creator's OC, with no more connection to the setting than my fanfic character from when I was thirteen. At that point she's about as jarring as the Team Fortress 2 cameo, except that's a comedy scene only accessed by doing something really stupid and Excellia's part of the final boss.
