Seven Deadly Sins[]
Mammon[]
- "Fizz, I've known that guy since the start of Hell, and He. Fucking. Sucks. Always has! He doesn't even do clown shit anymore."
- ―Asmodeus, to Fizzarolli
It is implied in "Oops" that Asmodeus has a close relationship with Mammon, calling him by the familiar nickname "Mam" when discussing the Greed Ring with Fizzarolli. However, the latter added that Asmodeus is "not a fan of the Mammon thing", hinting that Asmodeus has a sort of dislike towards Mammon.

Asmodeus confronts Mammon
In "MAMMON'S MAGNIFICENT MUSICAL MID-SEASON SPECIAL (ft Fizzarolli)", it was revealed that Asmodeus has a lot of hostility and dislike towards Mammon, having hated his selfish, manipulative, greedy and self-serving personality since "the start of Hell". While the previous details of their relationship are unknown, Asmodeus harbors intense dislike and even outright hatred for Mammon in the present due to his abuse towards his boyfriend, Fizzarolli and his psychological hold over the imp and has repeatedly tried to get Fizzarolli to quit working for him due to the obvious stress, pain and abuse he is forced to go through and endure in order to meet Mammon's perfectionist standards to generate profit for him.
Aside from their personal relationship, Asmodeus also has a professional one with Mammon. As stated by Asmodeus, he designs sex toys for Mammon to then sell and distribute for profit, including the Robo Fizz sex robot made in Fizzarolli's likeness, much to Asmodeus's displeasure.

Asmodeus threating Mammon
In "Mastermind", Asmodeus continued to be mocked by Mammon for defending Blitzo and he reproached him for dating low-class imps, but Asmodeus threatened him and together with Beelzebub, they humiliated and mocked him, with Asmodeus showing a satisfied face when his enemy was humiliated by Beelzebub.
Beelzebub[]

Asmodeus and Beelzebub supporting Blitzo
Asmodeus has a close and friendly relationship with Beelzebub as shown by the picture of the pair kept on Asmodeus' fridge in his tower in the episode "Oops".
In "Mastermind", Asmodeus sat next to Beelzebub during Blitzo's trial and the two were in favor of their mutual friend. The two humiliated Mammon when he insulted their romantic relationships with "lower class imps".
Lucifer Morningstar[]

Asmodeus and Beelzebub seeing Lucifer's old throne
As seen in "Mastermind", Asmodeus is shown with somewhat of a longing look when looking at Lucifer's empty throne, implying that he misses him or at least prefers having him leading Hell instead of Satan.
Satan[]
As seen in "Mastermind", Asmodeus works together with Satan and the other Deadly Sins in order to manage and govern Hell. Asmodeus does have issues and disagrees with Satan, as shown where Asmodeus was notably uncomfortable with Satan's lies about being Hell's first ruler and him having been in Hell before Lucifer's fall. Nevertheless, as shown from when Asmodeus sang along for Satan's song, it's implied that despite Satan's faults, Asmodeus still acknowledges the importance of his role as Hell's interim ruler in order to maintain control of Hell's chaotic denizens.
Employees of I.M.P[]
Blitzo[]
- "Is this- Fizz's former bestie, then lifelong enemy, then recent hero, now newly rekindled sort of friend, Blitzo?"
- ―Asmodeus, to Blitzo
While the two have not yet communicated directly with each other, when Stolas meets with Asmodeus to request an Asmodean Crystal for Blitzo's business Asmodeus refused as to not support someone that Fizzarolli hated, but didn't seem to hold any hate for Blitzo personally.

Asmodeus is surprised by Blitzo's question
Furthermore, he brought Blitzo along to accompany Fizzarolli during his performance at Mammon's clown pageant so he could convince him to quit due to Mammon's abusive behavior. Asmodeus also states that he trusts Blitzo to keep Fizzarolli safe since he was able to protect him from Crimson when he wasn't able to. After Fizzarolli's resignation, Asmodeus and his partner left with Blitzo in his limousine, where the imp asked who tops during sex, making Asmodeus look at Fizzarolli passionately.
In "Mastermind", Asmodeus was one of the two Sins who stood in Blitzo's favor during the trial for illegally using Stolas' grimoire.
Moxxie[]

Asmodeus sings to Moxxie about lust
Asmodeus made a passing comment and mockery of the latter's romantic relationship with Millie. After Moxxie's song, Asmodeus mocked Millie and Moxxie's display of affection and angrily told them to get out.
Romantic Interests[]
Fizzarolli[]
- "You are the most inspiring demon I have ever known, and meeting you was the best thing that ever happened to me. I adore your inventiveness, your attitude, your resilience. And... you're just the cutest little thing alive. Also, you are a waaaay better performer than Mammon ever was, and thaaat's just facts."
- ―Asmodeus, to Fizzarolli

Asmodeus and Fizzarolli demonstrate their loving affection
Asmodeus and Fizzarolli are a couple and business partners. Fizzarolli also works at Asmodeus' club, as shown in the episode "Ozzie's". Fizzarolli appears to be valued enough to be allowed seating with Asmodeus at his private balcony. The two share a mutual disdain of sentimental relationships, and they take part in mocking others, such as Moxxie.
Asmodeus was suggested to have a close relationship with Fizzarolli, as he worriedly rushed to Fizzarolli after the latter was struck by Moxxie's guitar, they can also be seen hugging each other during Moxxie's love song. This is highlighted during "Oops" where it is revealed that the two are in a romantic relationship, but because Asmodeus is supposed to represent lust, the two had to hide their relationship so he wouldn't come off as a hypocrite.
Asmodeus becomes concerned when Fizzarolli decides to go to the Greed Ring by himself, and became furious when Crimson and Striker took Fizzarolli hostage in an attempt to threaten him and he spends the whole episode of "Oops" impatiently trying to get him back through hastily making contracts with Crimson, only stopped from doing so by Stolas.
Much to Asmodeus's relief by the end of the episode Fizzarolli returned. After that he starts being more open in his relationship with Fizzarolli around his employees, threatening to silence them if they talk about it. He also agreed to give Blitzo an Asmodean Crystal after previously refusing to give him one due to Fizzarolli's bitter past with him, doing so only because Fizzarolli allowed it to be so.

Asmodeus comforts Fizzarolli and states his love for him
In "MAMMON'S MAGNIFICENT MUSICAL MID-SEASON SPECIAL (ft Fizzarolli)", Asmodeus comforted Fizzarolli when he was vulnerable about his disfigurement that he believed would make him an inadequate partner or mascot for any king of sin. Asmodeus explained to Fizzarolli that he is always the inspiration he fell in love with, showing how deeply Asmodeus loves Fizzarolli.
Asmodeus' love for Fizzarolli also made him protect Fizzarolli when he quit working for Mammon, and later Asmodeus uses his own body to cover Fizzarolli to keep him safe. Asmodeus even publicly stated his love for Fizzarolli despite any possible future repercussions, which made Fizzarolli blush.
In "Mastermind", Asmodeus regretfully looked at his phone when a frantic Fizzarolli begged him through texts on saving Blitzo during the trial, knowing that he could not save his lover's friend.
Goetia Royal Family[]
Stolas[]
- "Hey there, birdy babe. Haven't seen you since you crashed my club, how you been? Still gettin' yo' kink on with that feisty imp?"
- ―Asmodeus, greeting Stolas after his visit to Ozzie's
While it has not been confirmed what type of relationship Stolas has with Asmodeus, it is implied that Stolas is at least unnerved by him; this is further suggested when Stolas attempted to leave the venue while being lectured to by Asmodeus. However, they generally do not hold any ill will towards each other.
In "Western Energy", during the texts with Blitzo, it shows that Stolas finds Asmodeus to be invasive when it comes to his humor. But, Stolas did think that what Asmodeus said about him was funny.

Asmodeus welcomes Stolas into his office
In "Oops", the two show a friendly business relationship as Stolas meets with Asmodeus to discussing getting an Asmodean Crystal for Blitzo, which he ultimately refused to do so initially due to respecting Fizzarolli's dislike of Blitzo. Later, when Crimson held Fizzarolli hostage in order to threaten Asmodeus into signing contracts for his freedom, Stolas volunteered to read them so Asmodeus wouldn't make any regretful decisions. He was also happy for Asomodeus when the latter was reunited with Fizzarolli.
Furthermore, it shows that Stolas respects Asmodeus as a higher authoritative of power, even going to address him as "sire" during the contract signing.
In "Mastermind", Asmodeus was in disbelief to witness Stolas singing about being the mastermind who concocted the plot the misuse of his grimoire, but remained sympathetic after having to watch the former prince losing his power.
Enemies[]
Crimson[]
- "You probably just asked if I know who I'm dealing with. And, oh yes, I know. The weakest and most non-threatening of the Sins."
- ―Crimson, mocking Asmodeus

Asmodeus explodes with rage over Crimson's kidnapping of Fizzarolli
During "Oops", Crimson held Fizzarolli hostage and used him as ransom. Asmodeus was bewildered how an imp would dare to mess with him the way Crimson has, bursting into flames from barely contained anger. Though despite all this, he was willing to give Crimson whatever he asked for to ensure the safe return of Fizzarolli. He only objected to his demands when part of the contact clause was giving him permission to kill Fizzarolli and mount his head on the wall.