I'd be tempted to turn this question on its head and say: what kind of person is not toxic? Who do I not avoid? It would then be a much shorter list. How to describe people who I do not avoid? Hmmm...

Non judgemental

Non perverted

Calm

Natural

Serious but lighthearted at the same time

Quiet but warm and open at the same time

Relaxed, not very uptight, but not sloppy lazy either

Caring, but not overtly so

Attentive from within, but outwardly passive