Krysco
Aeon Hero
I used all characters that I use last night on For Glory and there are certain characters that are just awful to use, namely Sheik and Falco. The King isn't that bad to use but I feel over-reliant on dsmash since they roll a lot and it feels unfair since Gordos are more useful thanks to lag. My personal favourite character to use on FG is Ganon since lag hardly matters for a character that's more about reads and less about combos.
As for a site where you can have matches to improve, the only sites I know of are this one and Nintendodojo (formerly known as All is Brawl) but I'd imagine both are more about winning than improving.
As for a site where you can have matches to improve, the only sites I know of are this one and Nintendodojo (formerly known as All is Brawl) but I'd imagine both are more about winning than improving.