Birthdate: June 20, 1849
Name: Shinta
Named by parents

Kenshin (Heart of Sword)
Given by Hiko Seijuro (his sensei) because he felt that the name "Shinta" sounded too kind to fit a warrior

Nicknames: Hitokiri Battousai
Given to him because he mastered all forms of the Battoujitsu
Weight: 48 kg
Height: 158 cm
Style: Hiten Mitsurugi Ryu
Age during Bakumutsu
(the OVA):
14-18
Age during Meiji Era (the Anime/Manga): 28+ (don't know the ending yet, sorry)