Beam is very eccentric. He often goes along with Denji's plans no matter how crazy they are due to having a lot of respect for the Chainsaw Devil. His devotion to the Chainsaw Man is such that he always tries to protect Denji personally and will offer his blood to revive him, even if ends up severely hurting or killing him.
He is shown to greatly enjoy fighting, eagerly diving into packs of zombies and eating them.
Though he was greatly afraid of having to fight against Bomb to the point.