Which characters do you think could be bi/gay?

I know some people don't like Teddy's storyline of turning out to be bi, but personally I always got that vibe from her in season 6 with Cristina, and I feel the same about Cristina. Amelia was no surprise either and I haven't seen the spinoff if that's relevant.

I don't feel that way about every character, there's some that I think are completely straight- Izzie for example, I'd be surprised if she was revealed to be bi. Or Bailey.

I can't even describe what the vibe is and it's probably different for everyone so are there characters that you could believe were bi or that you'd be very surprised if they were?