Welp as the title says what are some champs i should get i usually play jungle,mid and support.For junglers i wanna try playing a tank jungler or something,mid i'd like an ad champ or something and for support anyone
Are some good tanky junglers.
I personally like Warwick, he's fairly easy to learn and has decent clears. And only costs 450 BE ;)
AD champs for mid.
Don't do much AD mid honestly. When I do, I usually go 
but I play this woman everywhere tbh lol. Fun picks I'd say Ezreal or Talon for the illusive plays.
Some strong supports currently.
Depends on your style. If you want a tanky support, Alistar, Braum, Leona, Taric, Sion are all good options. Or enchanters like Nami, Lulu, Soraka and Janna are good. I like Soraka for enchanters and Leona for tank support.
You already have Lux. Why would you want to play anything else when you can play Lux? I don't understand O.o.
