I just removed it myself, but in the editor I use it lists categories like that on the right. You're probably using the VisualEditor though, so there should a dropdown menu to the left of "cancel" and "save page" that has a categories bit.
What's the best way to reach you, message Wall? I helped alittle while back with the character page. I wanted to help out quite a bit more, and bring in others that would want to keep the wiki updated. I'm currently quite involved with the subreddit, and wanted to better organize stuff with a wiki.
Sorry for not responding before. Yeah, contacting me on this wikia's message wall is probably the best way to contact me. What do you need my help with, in particular?
Also, I've been on Reddit quite a bit. I'm thinking that a forum is not the best medium for some discussions, like "what's the best character/build, etc." I think this would be best discussed on a wiki or page specifically for that character. I'm going to try and redirect some folks here, but it's also way out of date. There is a lot of content on reddit, and I would like to help getting it updated a bit.
Yeah, character pages use Template:CharacterInfoboxNew for the top stuff. Some pages have extra info in a tabber/table, like Venom. That's a bit more complicated and hasn't been converted into a template yet.