The problem with profiles is that all those things are controlled by different plugins and aren't part of the default forum. Tokens and mentions are separate plugins so they work a bit differently to the other pages. I haven't really found a way to edit them directly. :(

I don't have a lot of control over individual user profile elements because they all take information from different 'stylevars' and that same 'stylevar' is used to control something else as well. So if I change it to work better with profiles, another part of the site might not look as good.

The background of profiles should have been transparent to start with but the forum is silly. I think I fixed it now!

Thanks for pointing this stuff out! I will keep looking into fixing the other things.

The social media buttons on Delta Episode are something I haven't bothered with because I'm lazy and would have to redo the images. xD But I will add it to my to do list.