If you specifically want MUGEN on Android :
: Most versions are designed as offline APKs, making them playable without an active internet connection. Download and Installation Anime Mugen 700 Characters Download Android
However, it is not a polished, commercial product. Expect unbalanced characters (some can one-hit kill), occasional glitches, and a steep installation curve. But for anime fans who want the ultimate crossover fantasy on their phone, nothing else compares. If you specifically want MUGEN on Android :