He is like the goblin slayer, with "unnatural" training they've received... They were unable to become "normal". Their vocabularies, their skill, their attitude, all of that was because of their past. Goblin slayer was with that kinda "twisted" rhea, and this guy is with the assassin's guild (assumed) or even been trained since he was young. Well, both of them are considered as "weird" by normal standard. This guy's "weirdness" less pronounced tho', compare to goblin slayer's obvious "weirdness".