HI, I'm pretty new and can only really play bots... I suck so... I wanna stop just playing Lux but I can't really find anyone who plays like her. I love spam attacks and mages. I'll keep looking but I don't think I'll ever find anyone that makes me feel like lux does lmaoo.
spam spells, so does 
. 
does high damage and is immobile like her as well
Try Xerath and Vel Koz
If you want other mages good at poke and burst you should look at stuff like Ahri, Veigar, Xerath, Ziggs, Vel'koz and Syndra. Xerath is probably the most similar to her.
Being new to the game and finding champions you like is really really hard... Especially when you don't really know a whole lot about the game. To be honest the current meta isn't totally great for mages, but if you like them I HIGHLY recommend Syndra and Orianna, especially if you are going midlane. Orianna is very easy to learn and can have high impact on the game. Along with syndra. Both feel great in bots and you can try lots of different items on them.
Xerath for sure
