Yo Dawg, You can't fuck with Kubo, he's the 10th Vongola, As said in his next arc.
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legato bluesummers cause he could have killed anyone. even most villain that are listed in this thread
Hmmmm... Frieza, Sephiroth........ nah for me it'd have to be cactus jack from zool on the megadrive i nearly broke my fingers tryin to kill him when i was a kid.
Carinage from Spider-man Honestly he is crazy and more deadly then Venom