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Barty never liked kids. He was always that guy who was on the verge of slaping the baby crying at the airport and was just generally disgusted and kinda terrified by them. Evan on the other hand looved kids and they loved him too. There was something about him that they gravitated towards and he always gave them a performance - speaking with little voices,dancing and jumping around,hugging them, telling them stories. However, when Luna was born both of them absolutely fell in love with the little baby. They were at Pandora's house spending time with Luna CONSTANTLY ("She is MY daughter, you do know that right Evan?" "We're basically the same person Dora, so really she is my daughter too"). Barty let Luna braid his hair while she was drawing random stuff on Evan's hand. Barty got a tattoo inspired by the first drawing Luna made him (he's all sappy like that). And that didn't stop when Luna was a baby. During their individual visits the boys would talk about each other and their relationship problem and 12 year old Luna was genuinely always super helpful, which raised the question were they that emotionally immature or was she that emotionally maure? (Its a mix of both) . They all gossiped together and when Luna went to hogwarts Evan and Barty were kinda going through separation anxiety and sending her a letter like every week. They also had a party when Luna came out as a lesbian to them ("Oh thank fucking GOD, Barty" "Yeah Luna don't worry obviously we would love you no matter what but this just makes it much easier")
I lowkey think Remus and Peter's friendship would be such a beautiful, unique dynamic. They're both more introverted and calmer than Sirius and James, and even though they undoubtedly have the time of their lives with the other two boys, it can get very draining for them at times. So sometimes they'll just sit with each other in their dorm while Sirius and James are out doing some dumb shit and they just make a puzzle or read their books side by side or they just fall asleep completely comfortable in each other's silence. Peter was very very good at drawing, especially sketching so one time during their 5th year in one of their hanging out alone sessions Remus asked him to teach him so they just had lessons like that all throughout the year. It was so weirdly fun for both of them. Sirius and James got sooo jealous when they saw that their two best friends were suddenly artistic but these bitches for the love of God couldn't sit their asses down long enough to learn how to draw.