I'm so sorry for what you're about to get as a long post.
Ellie: Megan (January Grayson) is Alastair's friend and close in age - 25. She has daddy issues to go with Ellie's mom issues. She is high energy and kind of exhausting. SO they'd make good friends. My others are a little older (lot older) but would ALSO be friendly with her.
Vivienne: She might/ should get along with Alec. He is closed off, rude af and generally not nice to a lot of people. Cross is an enforcer with her so she would know him from work - she can like him for his kid if she likes kids. Eris would not be her favorite I don't think. Penny and Austin would both be friendly to her even if she was not friendly back. Megan does a LOT of casual sex so they could be FWB or something.
Maxie: Listen he has to be friends with Megan. Idk if she'd break his heart (wouldn't be on purpose) but she has a lot of casual and if she tries dating and gets to close she shuts that down immediately. Feelings are not her friend. Penny and Austin would be friendly with him! Cross would be nice to him, he tried dating Rook once but they didn't work out even though both wanted it to.
Roger: Could be friends with Megan. EVERYONE should be frankly. She is not chill though, she just needs chill people to calm her down. Penny is super chill as is Austin they would be friendly with him though Penny is kinda cautious around men so she would be a little distant at first. Austin would love a BFF just saying. She's friendly and adorable. Cross would be friendly with him.
Theodore: Listen I will finish your sister in law and she will be friendly with you. (Her name is Aurora) Cross would be friends with him. He's a nice guy and if he likes kids, Cross comes with one to play with. Austin and Penny would also be friendly.
Mary: Come be Megan's friend and Penny's and Austin's. They will all befriend her. Eris would totally tempt her with dark magic. It's her favorite although Hector might yell at her for it. OOPS.
Fin: Cross will be his enforcer friend. ALL THE FRIENDS. Same with Penny and Austin who are his age. Megan will happily be fwb with him. Alec probably would get along with him. They could be friends.
Benjamin: idk. Megan would talk trash with him about this place.