Personally, i find that (so far) all of the female mid lane champs that use some form of orb/ball have sort of clicked for me. Syndra is my absolute favourite champion of all time, Orianna is like Syndra, but with more utility, and Ahri is just fun as hell to play. --- Syndra is my waifu. "My power is limitless!"
Thresh, Singed, Janna, Lulu. I just feel like when I play solo queue it really is solo. Everyone is just out to get the best score so they can't be blamed for the loss. With these champs I feel like I can just run around and set my team up for kills/victory
EDIT: How could I forget Shen?!? People say he is so boring but I love just being able to come flying out of nowhere to save the day in mid game. Then just split pushing and taking objectives for my team --- Back in 'Nam I fought off a gang of lesbian hippie child-slaving jewel thieves with nothing but a magic lasso.
Well the first game I bought Zed after reading and watching tons of guides on him I did amazing. I never do bad with Zed I do good with him all the time. Amumu is amazing and I always have fun playing him. I just started playing Janna and I can actually carry games with her, it's great. Quinn is really fun as well. Those are my top 4.