 If you liked
Devilman
|
 ...then you might like
Darren Shan
|
Both have a black haired, pure-hearted protagonist that gets turned into a monster, and they both have a best friend that cares alot about them, and who seem like they might be a bit insane. Their best friends have another similarity but that kinda goes into spoilery territory.
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Recommended by NitrogenAA