Sumeba Miyako no Cosmos-sou Suttoko Taisen Dokkoida
English name: Dokkoida?!
Genres: Action, Adventure, Comedy, Sci-Fi
Type: TV, Episodes: 12
Aired: Jul 13, 2003 to Sep 28, 2003
Studio: ufotable
Source: Light novel
Rating: PG-13 - Teens 13 or older
Synopsis:
The Galaxy Federation Police (GFP) desperately wants to cover-up its personnel shortage with new mechanized power-suits. Suzuo, 19-years old, desperately needs a job. Tampopo needs an earthling to fit the prototype of her company's suit and declares Suzuo the perfect candidate! Strong competitors and the wacky A-class criminals fight against our hero in diapers, but they must not recognize each other out of costume or the test results will be a failure- but it's OK if they all live in the same apartment building to save money, right? 

(Source: Sentai Filmworks)