 If you liked
Shingeki no Kyojin
|
 ...then you might like
Pupa
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Both these mangas are gory, with strong sibling relationship between the main characters. Want to study and know more about the creatures from characters who can turn into them.
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Recommended by Salamander2170
Both are very gory manga with a lot of death. They both have main characters who are very close siblings who have an odd relationship with their mysterious fathers. There is a character who can turn into something else, someone who can regenerate their body, and people who want to dissect and study the mysterious people who can turn into other creatures.