Tegiri is quite fixated on being an honourable person and despises people who partake in flagrantly illegal activity. When the owner of the anime store is found guilty, Tegiri has no issue with using his blade on the shopkeeper. Also, when Tegiri learns that the player is wanted for several offences, he loses his patience with them and lunges for the player almost immediately. Finally, Tegiri states that he often wanders the neighbourhood alone in search of evildoers to defeat, which was also how he stumbled upon Polypa's semi-demolished hive and consequently saving her from a painful death. 

He is also noted to be quite formal in mannerisms, inviting the player into his hive with a deep bow and taking his shoes off before entering the main living area (a Japanese custom). While he is more casual in speech, he frequently peppers his vocabulary with Japanese words. This is best illustrated when Polypa reveals she and the player are well-acquainted: Tegiri blurts 'Nani' (Japanese for 'what') before asking how that came to be.

Tegiri can be quite stand-offish in nature, preferring to be seen as an unwavering servant of the law. He scoffs at the idea of being friends with just about anyone, though he hints that sometimes life can be a little lonely for him. Despite his reluctance to form solid bonds with people, he still thanks the player for lending an ear while he was going on one of his rants regarding the need to uphold the rules and regulations stipulated by highbloods. The only time where he softens (somewhat) is when interacting with Polypa, being civil towards her and frequently inviting her over to his place to watch anime.