[Dr Kain]

Yeah, when Blade first started and I was watching it raw, I kept getting Kenzaki and Hajime mixed up during the first few episodes. Episode 5 is when Hajime starts to really stand out on his own.

Never had a problem with Kotarou though, as he looks like he is barely 18 while Kenzaki looks to be about 24. Kotarou is also one of the few sidekick nobodies that is not overly annoying either from the Heisei KR era.