Ben 10 Mugen for Android is a love letter to the franchise. It isn't polished like a commercial game, but the freedom to finally pit Diamondhead against Vilgax or create a dream team of Ultimate Aliens makes it worth the download.
If you're a fan of the Ben 10 franchise and classic 2D fighting games, Ben 10 MUGEN download ben 10 mugen android
However, I can give you a for finding and installing Mugen games on Android safely: Ben 10 Mugen for Android is a love letter to the franchise