I'm seeing a lot of people suggesting tanks, but I honestly found them very weird to play? I played a while ago, but I found Annie a fun character to learn/play, since she could be support or mid (not good for that these days, I think), had a relatively simple mechanic (balancing her charges), and had a nice mana-recharging Q for good farming. The trick is to find a playstyle you like and then branch out from there.