Who vs. That vs. Which

In the sentence:

He was completely different from his older brother Trevor, the senior, straight-A quarterback football player who everyone loved… Including her.

Which would you use for the word in bold?

Check this article for the correct answer:
http://www.grammarbook.com/grammar/whoVwhVt.asp

Yes, this is how I spend my time editing. ...and completely re-writing my character's back story. But I prefer to think of it as "flushing it out"...