I Love Tristana
No, seriously, I do. This isn't going to be some kinda bullshit complainer post about her; I've been picking her too much lately to complain. I'm just outlining why I enjoy her and why she's so much fun to me.
1: Kit synergy: Her basic abilities all have some kind of mechanic to reset each other that makes them all synergize really well. Her Q lowers her E's cooldown by 1 second every time she autos while it's on, her E lowers her Q cooldown by 1 second if her autos are targeting someone with the E on them, and her W resets if her E explodes on a champion from hitting 4 stacks or if she gets a kill.
2: Pushing and Turret Taking Power: Her E can also be put on turrets, and her Q, being attack speed, obviously works on turrets. In addition, once you have RFC, your statikk procs work on turrets and you actually outrange them for that 1 auto.
3: BURST!!!!: Combo: W at the target, E while in the air (1 stack), Q, auto twice (procing Statikk; 3 stacks), ult (4 stacks, bomb explodes, W resets so you can chase if the ult didn't kill them, 850 damage burst between ult and E). This combo 100-0's people, and it's not entirely difficult to get ahead on her if you play her early game right.
4: Self Peel/Mobility: Between her W, the resets, and her ult, she has an insane amount of self-peel and mobility, making it so that she doesn't really need someone to peel her later on if she plays teamfights right. Also, the ult knockback can hit multiple people if they're all clustered up.
has been one of my favourite champs since I started playing (around when Jhin came out)