For me, I use my real name for everything for a variety of reasons. (I'm old school, I won't get sick of it, it's easy for people to find my stuff online, it's professional, it's less confusing, it's unique, it isn't too specific to one thing I do.)
However, I think the most important thing to take into consideration is to be consistent! If you go by "ToxicRamen" online everywhere, then I would make that the name of the email. If your email was "johndoe@gmail.com" it would be really confusing for someone who knows you by "ToxicRamen."