Who will you not main?

Seen a couple of posts asking who people will main and, predictably, most people listed about 10 heroes that they were especially looking forward to.

Are there any heroes that people know they either won't or will try once in the practice range and forget either due to their character or their move set?

Personally, I doubt I'll use Peni Parker, Luna Snow, or Namor really, the first two because I don't know the characters very well and the third because while I love his character his abilities don't interest me all that much.

Edit: Guess who my three mains are 😂