If you have seen or read all these anime/manga, have you noticed anything similar about them? No? i have. and they are quite fascinating too.

What are they you ask? I'll tell you.

Anime: Bleach
Monster enemy: Hollows
Weopen to battle them: Zanpakuto
Main char: Ichigo (male)
second main char: Rukia (female)
Main char problem: Is part Hollow part Soul Reaper

Anime: D.Gray man
Monster enemy: Akuma
Weopen to battle them: Innocents
Main char: Allen (male)
second main char: Lenalee (female)
Main char problem: Is cursed by an Akuma

Anime: Buso Renkin
Monster enemy: Humonculus
Weopen to battle them: Buso Renkin
Main Char: Kazuki (male)
Second main char: Tokiko (female)
Main char problem: is now a Victor