a teaching/research 'fellow' [=a graduate student who gets money in exchange for teaching/research]
He attended the concert with a 'fellow' student. [=someone who is a student, as he is]
He has always tried to be of service to 'his fellow man'. [=to other people]
(..) to stand when you speak to a lady. You should have the decency to kneel before the gods. Don't spar with me, little fellow. For me, it's the knees. - You? - Hips. Ah. A man of the people. (..)2015 TvShow: Game of Thrones Title: The Gift Season: 5 Episode 7
(..) One of the first things I remember. His little brother Aegon. He became king. And before that, he was a jolly fellow, like this one. Get him south, Gillyflower. Before it's too late. Theon, wait. Not Theon, my lady. (..)2015 TvShow: Game of Thrones Title: The Gift Season: 5 Episode 7