reincarnator syndrome
man takes over a body immediately assimilates, naturally (as if sociopathically) forms relationships with the body's family friends and acquaintances.
-crazy, main character (probably goofy comedic relief type character before) just went to sleep for a moment and the author pulled out his entire soul and shoved this bastard in
-sister = pigtails big booba, but she doesn't notice her bro is someone else
yep all standard, standard right down to the D D, ah and the rapey randos
for what its worth i like the art style its slightly different from the usual
5/10 as far as manhua are concerned, very average