Susan.

Or Romania. Or The Rani

The Rani would have been funny as hell

I don't think Susan or Romana would have called him her boyfriend. Especially not Susan

True facts.

But he "You abandoned me long ago" Line would have worked.

Romana would have been nice though.

I really want her to show up. She would be the best most sensible person ever

Don't get me wrong, I love Missy and the actress and how it's being protrayed.

I just kinda want a different Time Lord/Lady than the Master?

Yeah. There were still ones out there when Gallefrey went.

I was actually cool with the Master's end being what it was, but it's Dr Who, no writer is going to totally write him off.

Trrrrrue

But motherfucking Susan man. Bring her back.

I want her back so much!

There are a lot of characters that I would have liked to see come back rather then him/her.

Preeeeeettty much.

I mean EvilSusan could have been fun.

Yeah. Especially since she was one of the companions who had a reasonably good end too

I'm not sure reasonable end is THAT true. I mean, the doctor left her. Sure, she had a boyfriend and a cause but still.

At least she was alive

My guage for a good companion end is pretty loose

Trrue

Better than Adric.

or the one he just straight up left at her wedding and never saw again without saying goodbye.

Yeah.

On the plus side.. Means the master was pretty gay for the Doctor.

Indeed