http://tvtropes.org/pmwiki/pmwiki.php/Characters/HighSchoolDxDOtherCharacters

All spoilers regarding the first four story arcs (volumes 1-20) are unmarked. Examples pertaining to the fifth story arc and Shin High School D×D can be spoiler tagged if necessary.

This page details the various supporting characters outside of the Occult Research Club in High School D×D.

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Kuoh Academy Students

Matsuda and Motohama

Murayama and Katase

Aika Kiryu

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Kiyome Abe

Kiyome Abe The Beastmaster: She's a beastmaster.

Mega Twintails: She has large twin-tails.

Ojou Ringlets: She has two small ones.

Passionate Sports Girl: Captain of the tennis club and teaches all the creatures she has tamed how to play as well.

Romantic False Lead: Although she and Issei have quite a bit of ship tease, it never really goes anywhere, even after she asks Rias to use him as The Beard to avoid an Arranged Marriage. Kiyome Abe is a third-year student at Kuoh Academy and the captain of the tennis club.

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Mr. Morisawa

Mr. Morisawa Voiced by: Tsuyoshi Aoki (Japanese), Ricco Fajardo (English) Mr. Morisawa is Issei Hyōdō's first customer who's also an Otaku. Intergenerational Friendship: Issei's first friend who's a lot older than him.

Otaku: He frequently reads manga and watches anime such as Dragon Ball. Not only that, but Ichiei Ishibumi himself is a fan of that series.

Mil-tan

Mil-tan Voiced by: Kenta Miyake (Japanese), Chris Rager (English) Mil-tan is one of Issei Hyōdō's first customers and is cosplaying as a Magical Girl but is also a guy. Ambiguously Human: Aside from being able to completely No-Sell Leviathan's sedation magic, and apparently, he's been to alternate universes in his quest to become a genuine Magical Girl.

Chekhov's Gunman: Whatever he is, he is a special case. Considering he nullifies Leviathan's hypnosis magic and beats the crap out of wizards with nothing but his fists...

Creepy Crossdresser: Well what do you call someone who's big, well built, and is cosplaying as a magical girl?

Tragic Dream: Played for laughs. He wants to be a genuine magical girl, even supposedly going to alternate dimensions, and Ise's first contract with him was attempting to get a devil who could do it.

Verbal Tic: Ends his sentences with "nyo". Even Issei says it when he was first introduced (though it's more like a Big "NO!" with how he said it).

Susan

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Vampires

In General

Lord Vladi

Lord Vladi Lord Vladi is the head of the House of Vladi, and father of Gasper Vladi. He's also a member of the Tepes Vampire Faction. All of the Other Reindeer: He, and the rest of the Vladi house, were fearful of Gasper due to his hidden-power, later revealed to be a fragment of the evil Irish god, Balor, having caused the mother of the Vladi house to die of shock after seeing Gasper's true form.

Badass in Distress: Despite being the head of House Vladi, he is confined in Tepes castle during Marius' coup.

"It" Is Dehumanizing: He only refers to Gasper as "that", out of fear toward his powers.

Parental Neglect: He refused to properly take care of Gasper due to fearing the power within his son.

Gasper Vladi

Gasper Vladi See his entry on the Occult Research Club page.

Valerie Tepes

Marius Tepes

Elmenhilde Karnstein

Church Exorcists

Freed Sellzen

Xenovia Quarta

Xenovia Quarta See her entry on the Occult Research Club page.

Irina Shido

Irina Shido See her entry on the Occult Research Club page.

Touji Shido

Touji Shido Touji Shido is the father of Irina Shido who is currently a pastor, formerly an exorcist. Cloudcuckoolander: Is where Irina gets it from.

Doting Parent: One for Irina.

I Want Grandkids: Gives up on this when Irina becomes an angel, he regains hope when Micheal has him deliver the doorknob, that leads to the baby-making room to Issei and Irina.

Shipper on Deck: Ships Issei and Irina, he happily encourages them to use the baby-making room a lot. He implies that he shipped them since they were children. Touji Shido is the father of Irina Shido who is currently a pastor, formerly an exorcist.

Masaomi Yaegaki

Vasco Strada

Ewald Cristaldi

Cardinal Deacon Ewald Cristaldi Ewald Cristaldi is the 4th top-ranking exorcist member of the Vatican Church with the rank of Eminence Cardinal Deacon. Ewald was the former wielder of Excalibur before the sword was split into fragments. He stood alongside Vasco during the exorcist rebellion. Authority Equals Asskicking: As a Cardinal Deacon of the Vatican, he can use his swords to attack his enemies.

Cool Sword: Fought in the exorcist rebellion with a replica of Excalibur.

The Lancer: He is Vasco's second-in-command during the exorcist rebellion.

Retired Badass: Was the previous wielder of Excalibur, and is able to prove in the current time that he can fight with a weaker Excalibur replica against the Heaven/StudentCouncil/Kiba team.

The Stoic: No matter the situation that he is in, Ewald is a very calm and collected person.

Warm-Up Boss: He is the first to be defeated primarily to show off the strength of Dulio's "Speranza Bolla di Sapone" technique that caused all the rebel exorcists Mooks to be forced out of commission.

Teodoro Legrenzi

Other Characters

Issei's Parents, Gorou and Miki Hyōdō

Hyōdō-Gremory Siblings

Shuri Himejima