Tetsuwan Birdy
English name: Birdy the Mighty
Genres: Action, Comedy, Sci-Fi
Type: OVA, Episodes: 4
Aired: Jul 25, 1996 to Feb 25, 1997
Studio: Madhouse
Source: Manga
Rating: PG-13 - Teens 13 or older
Synopsis:
Tsutomu, an average middle school kid busy studying for the final exams to enter high school runs into a man running from someone and gets caught up in the chase. In all the confusion he gets accidentally killed. Luckily Birdy (an interplanetary agent) knows a way to save him, unfortunately that means joining bodies to become one. So now he is stuck with this officer and along for the ride capturing criminals and saving lives.

(Source: ANN)