Tegiri is a anime fan that runs his own club, where viewing sessions are held in his hive. He has quite the passion for it, collecting figurines, manga, DVDs and replica swords, displaying the merchandise proudly in his home. He also reveals that he polishes his figurines daily, akin to how he cleans his blade regularly. Apart from that, he states that the main reason why he brough the player into his home is because he would like to engage in intellectual debates about anime. Yet, should someone have a weak opinion of what they prefer in anime, he will quickly snap at said person to leave as he has no time for those who cannot make up their minds.

Tegiri can be quite stand-offish in nature, preferring to be seen as a 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.

As a teal, Tegiri is well-versed in Alternian law just like his fellows. When the owner of the hobby shop he frequents is found to be breaking the law, Tegiri is able to give clear lists of exactly what legislation has been breached. He also feels the need to obey the laws laid down by his superiors, even though said legislation is prone to their whims. Unlike fellow tealblood Tyzias, Tegiri supports the Heiress and relishes the idea of obtaining a medal for his loyalty and service. Despite this, he sometimes struggle with the 'legal vs moral' argument, as that would mean killing Polypa for good. 

Tegiri is also quite fixated on being a honourable person, and despises people who partake in flagrantly illegal activity. When the owner of the anime store is found guilty of breaking the law, Tegiri has no qualms using his blade on the goldblooded shopkeeper. Also, when Tegiri learns that the player is wanted for several offenses, he loses his patience and lunges for the player almost immediately. Finally, Tegiri states that he often wanders the neighbourhood 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.

I'd imagine him sounding like Envy or Edward Elric from Fullmetal Alchemist.