Security Guard

The Security Guard is the person who guards the entrance to Hinata's workplace.

Appearance
The Security Guard wears a uniform consisting of a cap, grey shirt, black tie, belt, and dark grey pants.

After work, he wears a jacket and helmet to go home on his motorcycle.

Personality
The Security Guard appears very intimidating and serious, but actually harbors a soft side, especially for cats. When he appears to be glaring, he is actually just watching Kyuu-chan because he's cute.

He seems embarrassed of others seeing his softhearted side, such as when he hid when Hinata showed up, and ran away quickly when Hinata noticed his keys bore a cute cat-shaped keychain.

He seems to dislike socializing, hiding when he heard someone was looking for him to invite him out for drinks (Chapter 513, "In the Shadows").

Kyuu-chan
The Security Guard prevents Kyuu-chan from following Hinata into his workplace. This including having to dart around to keep him from entering, and pulling him away from the door. Despite this, he also finds Kyuu-chan very cute, and will play with him while he waits for Hinata to finish with work.

Uni
Uni recognized the Security Guard had a similar personality to him, and began to hang out around him, even going so far as to sit on his motorcycle when he was preparing to go home. The Security Guard then asked if he had a home to return to, and presumably adopted him, giving him the name Uni (Chapter 516, "A Place to Call Home").