If you want Mature, there's always Doki Doki Majo Shinpan...*Ahem*>.> and Duo >.>
some people consider Pokemon "Badass">.>
in any cases, there's always Shin Megami Tensei or SRW: Taisen.
I'm not gonna list most of the known ones since you'll probably have "known" them by now due to the advertising by the previous posters XD.
If you'd Like, you can play Ouedan 2, for hardcore rhythm(It gets tough, trust me>.>) or its counter part Elite beat agents.