Levi could be Feitan's little bro.
Both are insanely strong, smol and have squinty eyes.
Annie could be Pakunoda's little sister, or at least her niece
Both have a hook nose and blonde hair.
Armin is almost twins with Kurapika
Both are basically walking traps that are smarter than everyone else
I feel late to the party but it just came to me! Do you think Isayama get some inspiration from Togashi?