Right, let me actually attempt to answer this. I'll be answering this more as a first impressions/met a handful of times rather than them knowing everything we do as readers.
Dandelion: Would be far too trusting and open with everyone, of course. The court intrigue and scheming at Camelot would go right over his head. Though realistically he could really only meet Morgana and Nimueh, since you know, most of the others would have him burnt at stake as an elf (ok, hopefully Arthur would look the other way)... but I digress. He'd probably just be lured to Nimueh's realm never to be seen again lol.
The only notable exceptions that he would really dislike would be Seth and Masato, maybe Curtis (based on the little we've seen of him in season 2 so far). I think he would really like Hailey from Supernatural Misadventures and Eva from B2W because they both speak their mind and are kind of dorky haha.
Cordelia: I don't imagine she'd like anyone in AE land apart from Melinda. On the flipside she would probably like most of the Supernatural Misadventures cast (I feel like she'd be really curious about the green lady from season one, haha). I could see her being friendly with season one Athena, they actually have some things in common I feel like, couldn't possibly comment on season 2 Athena yet.
She would hate Camelot's prejudice against magic users so there's probably very few of them she'd actually want to meet (considering she wouldn't know Morgana has magical powers herself). Though if she got past that I'd imagine she'd like both of the royal siblings, and hate Uther (not me projecting here, honest :D )
Morgyn: I'd imagine Morgyn would really like Morgana, not in the 'I want to bed you' way, more so as an actual protégé, considering she's a promising young sorceress with a lot of talent and better yet, has the smarts to keep her emotions contained. With Season 1 Athena it would be the opposite because she's such a loose cannon. Season 2 Athena we know nothing about yet but if she's half as powerful as I imagine, I reckon their meeting would end with something blowing up, lol.
They'd probably initially be intrigued by the Vatores, though I'd imagine after meeting Lilith they'd stay out of her way because they are not so keen on other dominant personalities, so ditto with Seth (if both Morgyn and Seth survived that encounter, that is, haha). I could see them becoming very interested Willa because she is so enigmatic and elusive.
Micah: I think Micah would gravitate towards Lilith *sigh* though he would probably become disillusioned with her later. He would loathe Seth. And obviously he'd hang out with Faith in a grocery store aisle in his underwear, because that's canon now :p
Not a clue how he'd respond to the B2W guys, though I'd kind of like him to meet Kirino. I could see him forming a weird friendship with Ian for some reason. Camelot... oof, it's hard to imagine him in court, I feel like he'd linger in the shadows. He'd probably try to strike a deal with Nimueh to see if she could cure his vampirism somehow (or something equally stupid).