I thought it might be a good idea to pool resources so you have a one-stop-shop for all your fighting game knowledge needs.
Shoryuken Wiki:http://wiki.shoryuken.com/Main_Page
Covers all things Capcom, as well as a lot of your SNK stuff
Tekken Zaibatsu Wiki:http://www.tekkenzaibatsu.com/wiki/Main_Page
All things Tekken
8WayRun Wiki:https://8wayrun.com/wiki/
SoulCalibur and soul edge
Dustloop Wiki:https://www.dustloop.com/wiki/
Guilty Gear as well as most other ASW titles. Also, Gundam?
Mizuumi Wiki:https://wiki.gbl.gg/w/Main_Page
Their words:"Mizuumi Wiki is a service dedicated to hosting wiki pages for niche versus and fighting games." Lots of anime fighters, as well as Samsho and a few others
I'm sure I missed stuff. If you find something that would fit here, please add it