[quote=@DisguisedDemon]
<Snipped quote by Rin>

Wtf is this show??? Honestly, I don't know how they've made it this far... xD
[/quote]

Without spoiling it, Build Fighters revolves around people building model Gundams and then using an advanced simulation system to make them fight in battles. That picture is the result of someone making a... custom... build. The anime themselves have lots of references and easter eggs to previous shows. For one thing, characters tend to make custom builds using official models as a base. Plus actual previous anime characters can often be seen in the background or part of crowds if you pay enough attention.