★~ for Julchen and Ariadne, please~
Well, if there's one thing Yomiel can do like a pro, it's hold a godsdamned grudge. With Julchen, it's one of those 'first impression that sticks forever' kinda things. I mean, at first he could dismiss her as kind of...loopy and a little delusional. That was easy enough to deal with until she tried to punch Apollo. Despite how traumatized she seemed over the event, he never once regretted possessing her. What's some crazy chick over Apollo's poor face? If he's anything, it's most certainly protective and maybe a little overly-so. In his eyes, he had every right to stop her and that's not likely to ever change.
Unfortunately, the two of them are equally stubborn so she's been featured in a prominent place on his lengthy Shit List for a while now. But the few times they've managed to converse a little since haven't been too bad. The only reason why he'd put forth an effort to understand her is because Apollo seems to readily do so and he trusts his judgement. He's gotten to the point where he's willing to see her in a more neutral light, that stubborn negative tinge wearing off a little every time they talk and it doesn't end in insults or threats. Because hey, maybe she wasn't crazy in the first place--still gives her no right to run about punchin' innocent bunnies though and he'd flip around on her so fast if she did anything again. He's like a big angry dog, the kind the county would have you put down for attacking everyone that comes too close to their owner. But as long as anyone's on Apollo's good side, he makes an effort to keep better grounds with them.
Now for Ariadne; here we have a lady on the opposite end of the spectrum. When considering naming his friends the answers are always Apollo and Ariadne. They're easily the two people he's grown the closest to and some of the first to even put forth the effort to talk to him. Because of this, he's grown a bit protective of Ariadne as well and this is basically the cause of most of his hatred for Tony Stark. The rest of it because he's just generally a narcissistic douchebag and so is Yomiel so the chemistry is horrible. He's just generally concerned for her well being in that whole...budding relationship with Stark since he's pretty damn positive the latter is gonna fuck it up big time and hurt her in some unforgivable way.
When I think about it, the reason why he started growing close to her was probably because of how damn nosy she is. Whenever anything went down she was instantly the curious one, wanted to know everything, even got Yomiel to tell her a good deal about his past. And he trusts her with things like that since she's never given him any reason not to. And the fact that she's the one who stopped Apollo from becoming a murderer? Yeah, that goes a long way in her favor. He couldn't give any fucks about what happens to Cabanela but putting Apollo through something as horrible as becoming a murderer, risking throwing his everything away and over him at that... He couldn't thank her enough. All in all she's pretty damn ~important~ to him and he considers her a close confident should he ever seek advice--particularly when it comes to Apollo and decisions involving him (help how do I relationship???) ))