Whoever you think would be OP and most comfortable to you.

Depends what role do u mostly play. Tell me and Ill tell u!

i usually play mid and jungle. hopefully that helps

TheCoolKidShane wrote i usually play mid and jungle. hopefully that helps

Ok well idk other people but for me I usually top gragas and jung gragas. If u wanna mid get katarina, but she is a big snowballer there fore that means you might wanna play safe in early game and just cs. If your kat and your lets say for an example 0-4 at 10 minutes..You really arent going to help your team out that much. Your wave clear is terrible until you get two hard damaging ap items.

EDIT If you want a good mid laner I would get Kassadin. He has good roaming..But, with this new patch coming out he is getting nerfed AGAIN! So either get Gragas or save more ip in my opinion i'd just save more. Hope I helped

For jungle I would either get Shaco or Fiddlesticks. For mid I would get Karthus, Lux or Mordekaiser, just my personal opinion

For Jungle, i would say to get Shaco


For Mid, i would say to get either Katarina or Kassadin

Karthus for sure so fun to jungle and an amazing mid laner help you work on your map awareness aswell with the global ult

For mid get Kat or Kass,
If you want to go aggressive get Kass But if your looking for nuke potiential Get kat.

And for jungle Get shaco,
Hes good for ganks and doesn't need a leash.

And This is what i think is good Olaf
He really can't get counter much, Cc Doesn't affect him much unless your Ulti is down but Yeah his [Q] Has cc and the range is amazing! Plus you can build him either Tanky with hydra or just full Nuke.

But in all i'd save up for a better mid lanner or jungler Like for jung id save up for either Rengar Or elise Just because they can escape good ganks and etc For mid i'd save for zyra, Syndra, Yasuo, or Orianna

I really hope this help you pick what you want
more questions or just wanna play add me on league and skype
League IGN:BlackBeats
Skype Name:tehroyalfool
-TheRoyalOne