Karasu can communicate with Mammon's crow familiars but doesn't have any of his own.

Tenebris has his spellbook which is far too sentient and dangerous than any cursed tome has right to be. Any additional familiars he summons will look like cats.

Belial can communicate with demons or creatures that are strongly aligned with the fire element. Shaitan is a demon with their own free will but actively chooses to be loyal to Belial and could be considered "his".

Fleurety summons little water and ice elementals that follow him around. They don't serve much purpose but he finds them amusing. (They will throw little snowballs at random demons walking by and he makes no effort to stop them.)

Meta has an enchanted quill, although its really an extension of his own consciousness rather than a controllable entity.

Gabriel has an owl familiar. It's a convenient way for "him" to be in two places at once, he's very busy.

If the Demon OCs were Kinktober Prompts

If you wanted to drop one of your preferred demon OCs into situations, these are some of the hypothetical Kinktober-inspired prompts that would suit them best.

Karasu is probably the least extreme, with most of the others having their own varied preferences in the middle ground. Fleurety has some niche interests that might not be for the faint of heart.

The Tenebris fan club has been blessed~ long hair open shirt bedroom eyes omnomnom

Please send all your love and appreciation to @silverrings-n-prettythings for such an amazing piece of art! 🥰

So we're talking about eating humans in a Hannibal Lecter sort of way and not a sexy innuendo way, right? 😂

Thankfully none of the demon OCs would've had much chance to do that even if they wanted to, with one possible exception that wouldn't be relevant by the time MC visits the exchange program.

Azra and Zee, while part of the demon nobility on a social level, aren't named demons that would be easily summoned by random humans witches or sorcerers. Neither of them have an appetite for consuming humans in that way either. Most of Zee's visits to the human world are on Azra's behalf and related to business operations at The Fall. While Azra has been to the human world for business and pleasure, he's more interested in sleeping with humans rather than killing or eating them.

Maybe if Karasu were more bloodthirsty or power-hungry, he might've gone out of his way to visit the human world more often. Even if humans attempt to summon karasu-tengu as one of the yokai, Karasu would never answer such a summons himself - he would send another one of the Devildom's lesser crow demons in his place. He avoids going to the human world if he can, and he won't ever allow himself to be in a position where he can be compelled by humans or bound to one in a pact.

Bathin - his former incarnation, anyway - spent a lot of time dealing with humans as a member of the Ars Goetia. Killing or eating humans for fun never appealed to him and his approach was more like Azra, honestly. He hasn't spent much time in the human world since he respawned and he only goes if he's accompanied by Mephisto.

Belial is in the same situation as Bathin since he's a member of the Ars Goetia as well, and one of the more powerful demons on that list: he is often summoned by humans but he'd never consider eating one. If a human angers him and a bargain or pact goes badly, he might rob them blind before maiming or killing them, but eating them never crosses his mind. (If he leaves one of his underlings in charge of dealing with a pesky human he doesn't want to deal with anymore, that's another story.)

Tenebris is the only demon that might've indirectly eaten humans in the past. If human bones or blood were required for whatever dark magic he was dabbling in, he collected those parts himself. He didn't kill humans for fun, it was simply a means to an end. He stopped doing those things a long time ago.

If this is a race, Azra wins because he's the only one that's not going to waste time trying to find alternative ways of breaking free. Hell, he's going to be undressing you and himself while he jokes about what a great night it's turning into.

Belial could be a top contender as well, if he doesn't get distracted trying to blow up one of the walls first. You know, for science. Where Azra is a bit more focused on getting naked and getting things going, Belial is the one that takes his time teasing you (and loving every second of it).

Tenebris hates how exciting the prospect is, but he does check with you to make sure you're okay with it before he pounces. If he's been pining for you up to this point, he's not going to resist this very tempting opportunity.

The angel OCs - Gabriel & Uriel, Habuhiah, Meta, and Seraphiel - are the ones that hesitate because they want to go over ground rules and consent-related topics first. It's not that they're not excited about a chance to get frisky with you, but they want to make absolutely sure you're comfortable with what they have in mind. (Meta and Habuhiah are a bit more giddy at this turn of events, even if they try not to show it. The others take their time - whether that's to make you more comfortable first or just to draw out the excitement, it's hard to say!)

Zee and Karasu take the longest to accept this is the only logical solution. It's easier for both of them if you have a solid friendship with them first. If you're only acquaintances, it takes even longer. (Zee will cave faster than Karasu does in any circumstance.)

Did the Demon King love Tenebris? I think so. He loved his sons in different ways but he could've done a better job expressing that with both of them. You could argue that Tenebris had a better relationship with his father than Diavolo did, although each of them feels that their brother had it "better".

As for your second question, I think SUPER long hair is so pretty but so impractical. (note: my hair is about mid-back length and it drives me nuts sometimes so my opinion is a little biased.)

I think if Tenebris had extremely long hair, like knee-length or longer, he'd wear it in thick braids or something since a simple ponytail would probably still be uncomfortably long for him to wear, especially in any kind of battle-situation.

I usually picture him having hair that's waist-length, so about the same or a bit longer than demon!Meta's hair is.

I actually have a detailed post in my drafts about the OCs and who would want to be in a sugar baby or FWB arrangement. Until then, here's a brief glance at how they rank, with more detailed/personalized explanations coming up in another post:

*Special circumstances apply

POV: Your half-brother is the demon prince and won't stop bugging you to attend his fancy new school.

Fun facts about Tenebris attending RAD:

Some of them I’ve talked about but others I haven’t! The range of opinions varies greatly between them so it’s worth discussing, for sure.

Solomon is a frequent guest of Asmo’s at The Fall so it’s not unusual to see him there. Azra tries to ignore him because he lowkey hates his guts. (Solomon dated Meta in the past and he wasn’t quiet about their relationship or his fondness for him. Azra denies being jealous and bitter about it but he totally is).

Zee finds him a little annoying when he causes mischief at the club but they don’t interact much. Solomon has never approached Zee for a pact, not that he would agree to one even if he did.

Karasu is a bit skeptical of Solomon’s motives and doesn’t completely trust him. He’s one of the older demons who’s seen Solomon at his worst and that’s not easy to forget. Solomon has hinted at making a pact with him in the past and Karasu refused.

Tenebris is sort of like Karasu and remembers a different version of Solomon that he didn’t like at all. He and Solomon have a rocky history from that time period which doesn’t help. They have a lot in common and could be good friends in theory if they can get past their issues.

Belial and Solomon are in a pact. They’ve come a long way—the first time Solomon summoned Belial, the demon was so insulted by him that he nearly blew him off completely. They’re on better terms now but Belial likes to remind Solomon that his pact comes with a heavy price.

Bathin and Solomon are in a pact as well, but it’s currently dormant until Bathin comes of age. Bathin doesn’t remember anything from his previous incarnation, but Solomon visits him occasionally to check on him.

Meta and Solomon bonded over their shared passion for knowledge and books and history. They had an on-again off-again affair in the past and are presently good friends.

Seraphiel knows Solomon because Solomon visited Meta occasionally, or Seraphiel escorted Meta to visit Solomon in the human world. (Once Solomon proved he could keep Meta safe, Seraphiel was happy to stop being the third wheel on those little visits.)

Gabriel and Solomon speak often to resolve trivial matters between the two realms that don’t require Michael’s direct involvement. Uriel is usually with Gabriel if he has to meet with Solomon in person in the human world, whether it’s to negotiate realm issues or scold him for something he’s done, or just to catch up.

Solomon and Habuhiah have a lot in common although you might not know it at first glance since their personalities are so different. Solomon sends her messages often through Devilgram to discuss potion recipes or his latest experiments. She has a keen eye for alchemy so she can usually help him troubleshoot things, like if his latest concoction accidentally blew up part of his lab because he didn’t prepare a certain herb or mineral properly first. They also trade ingredients since she wants to try recipes and teas native to the Devildom but doesn’t want to go there herself to acquire them.

None of them are strangers to bloodshed. If a demon attacked MC or put them in harm's way, the demon OCs are all willing to protect (or avenge) MC with violence - lethal violence, if necessary.

Very little hesitation: Azra, Belial

Azra is impulsive so Zee might have to reign him in a bit to minimize any social or political fall-out. Belial is a bit more devious and MC might never know about what he's done. Whatever demon hurt or bothered MC simply vanishes without a trace.

Wrath demons gonna wrath: Zee

He tries to keep a cool head about things but where MC is concerned, he's probably the most volatile. If he is acting on Azra's behalf, he's calm and methodical; if he's acting on his own impulses, he's reckless and even more dangerous than usual.

Avoids violence if possible: Tenebris, Karasu

Tenebris might use his ties to Diavolo to try and deal with things in a different way, but he can be pushed to violence in the heat of the moment if angered or scared enough. Karasu is similar in that he'll try to ruin a demon's social reputation, financial holdings, or political standing first as a deterrent or petty revenge, before resorting to violence.