The Biggest Hurdle in My LoL Life

I'm a mid AD player.

If my top or jungler locks in AD first, the game falls apart because I don't know how to play AP.

So I'm trying to learn AP, but I need champion recommendations.

I play with a friend who's a jungler and a Warwick one-trick, so I'm the one who has to adapt.

My main is Yasuo, and the only AD assassin I play is Zed.

Since I'm usually a bruiser player, I want an AP champion that can scrap just as hard.

I'm thinking about Sylas, Neeko, and Anivia.

Please recommend other champions too.