Raised among boars It was shown in the series that Inosuke's actual mother runs away from chasers when he was just a new-born. Her mother was afraid that if she would be caught, the chasers will kill Insouke so she jumps off a cliff into the river.

His wild personality Inosuke was raised by the boars as the latter found him when his mother jumped off the cliff. Since childhood, Inosuke struggled to survive, He fought animal. However, his personality is a consequence of his upbringing. 

 Why he made cuts on his two-blades Inosuke thought it would get effective to slash demons with the cuts he made on his swords. We remember him making cuts which made the sword maker angry. However, he realised later that it's technique not the cuts. 

Demon calls him messed up In a fight between Inosuke and Upper Moon Demon, our protagonist dislocates joints of the demon. He foght so rigorously. Startled by his attacks, Doma said that he has never seen such a fighter who is so messed up. 

Flexibility is his quality During the fight with Daki, he shifted his heat to different place so that the demon could not attack. He is flexible who can bend his head backwards far enough to almost reach the ground. He can even misplace his internal organs whenever he wants.