Kenji is Himura's and Kaoru's first child. He's basically a clone of Himura (except his hair is cut like Kurt Cobain... kenshin cut his way a similar way towards the end of the manga... I think after he recovered from that little fit of his?).
Hmm... the OAV may be about how Kenji recieves the sakabatou from Yahiko... his first trials and tribulations, blah blah blah... Himura's legacy lives on, yadda yadda yadda.
Hmm... the OAV may be about how Kenji recieves the sakabatou from Yahiko... his first trials and tribulations, blah blah blah... Himura's legacy lives on, yadda yadda yadda.