My highest levels;
- Illari - 63
- Ramattra - 34
- Zarya - 33
My lowest levels;
- Pharah & Junkrat - 5
- Echo & Tracer - 4
- Freja - 1
The high Illari level is due to my previously self-imposed ‘play every support for 100 hours’ goal. Prior to her release, I had already almost accomplished that with all the other supports, so I just pretty much one tricked her for a while, causing her level to shoot way above all the other heroes. After I reached my goal, I started dividing my playtime semi-evenly across so many different heroes that it’ll probably take quite a while before I get even close to Illari with anyone else, especially since I do still also play her pretty regularly 
(also I just wanted to say that I don’t dislike the heroes I have a low level on or anything like that, I just very rarely play dps, and when I do, I mostly just play other ones that I enjoy more)