Both The anime Gatekeepers and TokyoUnderground ,Features Main Male
Characters that control Wind, and both series also shows the main male Character
discovering their Hidden Powers in Desperate Situation
also both series ,features the main male character,meeting other humans with
If Beet the Vandel Buster is Gate Keepers younger, more adorable brother, Busou Renkin is definitely the cooler, older brother.
In terms of style, humor, and visuals, both Busou Renkin and Gate Keepers are very similar, but Busou Renkin just has that extra bit of over-the-top flare that makes it stand out; and the storyline and storytelling are superior.
Being the older brother however, Busou Renkin lacks some of the innocent, adventuresome charm that Gate Keeper has about it.
Beet the Vandel Buster feels very much like Gate Keepers kid brother. Beet the Vandel Buster is the PG to Gate Keepers PG-13, so the style of humor is a little different and toned down, but it also has a tighter nit cast, a little more cohesive adventuring story line. The settings are completely different, the plots aren't alike at all, and the style isn't really either (Gate Keepers a little more zany), but the "vibe" feels very similar. A kind of adventuring, feel-good warmth and light hardheartedness that makes it an easy watch.