Docprof says:

Doctor Professor is the internet’s leading expert on what Doctor Professor thinks about videogames. He is also the author of Pixel Poppers, the internet’s leading blog on the same subject. He can be found on Twitter as @doc_prof.

There is no evidence that he is either a doctor or a professor.

He’s called “Docprof” for short.

Senpai-chan says:

Senpai-chan is a student. She has other traits as well.

Probably.

It also appears that she’s found Twitter, as @_senpai_chan_ sure looks a lot like her.