Melissa's Ronan: Best man # 2 is gonna best man. He's really happy for these two idiots and it shows. He even wore a purple suit and gave a sappy ass speech (not a "Dick" or a "Maggot" in sight), that's how much he loves them. He's determined to make sure they get the wedding they deserve but he's not a perfectionist with this kind of thing so any issue will get a hasty patch up and a shithead distraction. He'll dance stupid if he has to, etc. He'll also play bouncer if anybody gets too tipsy. Otherwise, he's here to have a good time and eventually tell everyone to get the hell off his farm. (He also surprised the bride and groom with a private curtained off sitting area with the dreamiest cushions and fairy lights for when they want some privacy but aren't ready to call it a night.)
Noct: He'll come with his fiances and wear a green suit with no tie. He mostly didn't want to look like he rolled out of bed next to his hot SOs. He'll drink a bit to loosen up and dance awkwardly and stash away ideas for their own wedding even if he knows this one is very different lmao.
Cayden: He's never been to a mortal wedding so he's just following Eli's lead. He doesn't own a lot of clothes so he went with a pale pink suit instead of anything too bright. It should at least look good next to Eli's bright red and Del's shiny flower suit. He's been to his fair share of fae revelries so he's honestly just surprised everyone's keeping their clothes on and there's no tricky magic to worry about. He can dance fairly well and he's good party company. He'll ask a lot of gentle curious questions about customs and drink only enough to realize there's nothing strong enough to affect the fae and therefore nothing to distract him from the hotness of his not-dates.
Shiro: He'll come with his whole little family and they're all in bright pink suits, Kipp included. Shiro tried to keep his a little casual. He's soft about a wedding and will get a little tipsy and I love everyone in this bar because that's just how he is. Insert lots of dancing with his husband and their son and every friend who isn't mean enough to fend him off. (Stevie, he should dance with Blue, their height difference amuses me ty.)