Even though Lev was utterly confident that the silent kid was that of the Carnage Class, Titania didn't want to believe him. After all, the child was the most indifferent and timid of everyone in the group. There was no way someone that acted the opposite of his Human Class is of that class. Titania was inclined to believe that he was either an Elemental Class or maybe someone from the gentle giant type Gargantuan Class who don't really fight despite their sturdiness.
The kid could also possibly be a Panzer Class. Panzer Class was derived from the term 'Panzers', a type of tank that existed in Main Earth history. They are defensive in nature and pack quite a punch but if they could avoid a fight, they'd rather avoid it. That's what a Panzer Class human acts in terms of fighting.
"Yup, that's right. If you don't believe me, then wait a couple of minutes... wait until someone bumps into him or disturbs him." Lev continued.