Dakora was born in the world of Death Note, he is a Spirit Saiyan. He finds the Death Note and meets another Spirit Saiyan named GokL. He is not strong, be he notices things that some people do not. That is why he became L's Succsessor.
In the picture, he is an 16 year old kid who has been at Wammy House and has had training to fight but always gets beat up by Vegello. He was just walking when he heard about the death of L, but he wanted to focus on Kiriza (Kira and Frieza pun) killing. He wanted to figure out about the mystical Dragon Note he was killing with.