User blog comment:Crimson and Darkness/Volume 24 discussion blog/@comment-30924344-20180101234213/@comment-29963364-20180102110101

If you think about it the other way...

She is the Main Heroine. So her name itself is way more important, and has more "impact" than any other nickname/title.

So, isn't it actually kind of fitting? Everyone else has a nickname/title for their team names, while for Rias' team...

Rias Gremory Team....... enough said.