Main
Hound
- Abusive Dad: Hound was always ignored and neglected due to his rebellious attitude.
- Action Hero: Hound is very skilled in weaponry and hand to hand combat.
- Blinded by Rage: Hound went on a killing rampage of 4 years after learning her adoptive mother was killed by exorcists.
- Black Sheep: Hound is ignored and badmouthed by his siblings due to his immature actions and lack of royalty traits.
- Bouncer: Hound used to be one for Asmodeus when he was 12, in addition to being a Professional Killer.
- The Big Guy: Even though he looks skinny due to his clothes, he is extremely well built and constantly works out.
- Character Development: At first he seems to tolerate his siblings but after learning what Cereza sung and Sable did nothing to help Blitzo at Ozzie's he holds them both in contempt. Also managed to open up more, in Seeing Stars he admits to Blitzo the reason why he and Loona hide their relationship from him due to his fear of losing her. In Exes and Oohs he finally tells Loona the reason why he killed all those Exorcists.
- Dark and Troubled Past: Hound grew up neglected by his father and constantly being mocked by his siblings, he found some happiness with his adoptive Imp mother but still felt left out of the family. The last straw happened when he found out his father tried to kill him by making him fight a powerful Overlord.
- Jerk with a Heart of Gold: He acts like a douchebag but still shows to care a lot about the people he loves. Even shows some sympathy towards Moxxie after his failed attempt to impress his In-Laws in Harvest Moon Festival. In Seeing Stars he tries to stop Loona from beating the crap out of Blitzo and even helps him and Stolas escape the tv set, we are also shown a flashback where Hound defends Loona after her siblings started insulting her.
- Understanding Boyfriend: Whenever something is troubling Loona Hound always helps her.
- Unfortunate Name: His name is literally the last part of Hellhound.
Sable
- Bystander Syndrome: Sable always knew the damage his father caused to Hound but decided to do nothing due to not wanting to cause any trouble. He also did nothing when he promised Hound that he would help out Blitzo at Ozzie's.
- The Gunslinger: Sable is a weapons expert.
- The Oath-Breaker: Sable promised Hound he would help Blitzo at Ozzie's. He didn't.
- Parental Favoritism: He is the favorite child of the family.
- Professional Killer: Sable has a reputation as a professional hitman that works for the elite class of hell.
- Retired Badass: Due to working with Charlie in her Happy Hotel idea Sable had to retire from assassinations coming from Demon royalty and Overlords.
- Right Behind Me: Played with. He insults Loona without knowing she was in another room hearing everything.
Cereza
- Alcohol-Induced Idiocy: In Ozzie's after a few drinks with Verosika she ended up insulting Blitzo during the song.
- Annoying Younger Sibling: Different. They are triplets. Cereza always berates Hound for not acting accordingly to his status.
- Daddy's Girl: Downplayed. Cereza has the delusion she is the favorite of the triplets and is always trying to prove her worth to his father.
- Hopeless Suitor: She has a massive crush on Vortex but due to her status as royalty and him already having a girlfriend it was impossible for her, she always gets depressed after seeing him.
- Inferiority Superiority Complex: Due to growing up in a royalty status rather than the common Hellhound lifestyle she thinks of other Hellhounds as unworthy, that Imps are nothing but servants and sinners as mindless idiots.
- Magic and Powers: Cereza is the most skilled in magic.
- Right Behind Me: Played with. She insults Loona without knowing she was in another room hearing everything.
I.M.P.
Loona
- Birds of a Feather: Hound and Loona gave each other what no one could in their youngers years. The feeling of love.
- Love at First Sight: In The Purpose when Hound first arrives at I.M.P the first time the two lock gaze their tails started waggling.
- Understanding Boyfriend: Whenever something is troubling Loona Hound always helps her.
Blitzo
- Love-Obstructing Parents: Whenever Hound and Loona want to show affection Blitzo tries to stop them.
- TwerpSweating: In the Pilot episode Blitzo breaks into Hound's apartment in a movie night.
- In Spring Broken Part 1 Hound tells Blitzo the many times he has found him hiding in his wardrobe every time Loona stays in his apartment.
- In Spring Broken Part 2 after learning that Loona and Hound are dating before they went back to hell, Blitzo shoots him in the foot as retribution.
- Also in the drabble The Bet which takes place after that, he tells Hound that he is lucky that he won't castrate him and that his pay has been reduced.
- In Harvest Moon Festival he threatens to shoot Hound again in the foot. Twice.
- In Truth Seekers after learning how many times they "do it" he threatens to cut of his junk.
- In Exes and Oohs he told Crimson if it was a suicide mission he could gladly send Hound to do it and in the same episode he yelled that there would be consequences if Loona and Hound did something while he was gone.
- Parents as People: Even though he cares and loves Loona he treats her as a child rather than a woman which is annoying to both her and Hound.
Moxxie
- Alcohol-Induced Idiocy: The time he got drunk at the beach.
- Weak, but Skilled: While lacking in the physical strength department, Moxxie knows a lot about weapons and can handle any kind of gun although he finds annoying that Hound won't keep maintance on them.
Millie
Antagonists
Vor'varg
- Abusive Parents: He never like Hound and always thought of him as a stain on his name.
- Parental Favoritism: He favors Sable due to his skills and manners
- Rags to Riches: Is mentioned by Asmodeus on The Purpose that Vor'varg used to work as a bouncer before becoming royalty.
Asmodeus
- Bad Boss: He paid very little to Hound and always gave him suicide missions. Treat him like dirt and always tried to rip him off in favors.
Violet
- Black Mail: He threatened to tell Hound's family about his killing spree against the exorcists if he didn't marry her.
- Psycho Ex-Girlfriend: Played with. She is actually in crazy love with Sable.
Others
Octavia
- Childhood Friends: She and Cereza met after the latter was assigned as Octavia's Mentor Archetype in magic.
- False Friend: After learning what Cereza said about Loona she isn't sure anymore what to think of Cereza.
