B'Elanna: Sort of blames herself for her father leaving their family and has to come face to face with the sad little baby version of herself that she's blaming and it gets ugly but also heals a part of her. The B'Elannas don't have beef with each other REALLY, they have beef with their dad and the world.
Tuvok: Child Tuvok thinks adult Tuvok is a boring traditionalist who turned out just as his father always wanted and resents him for it. Sheeple. Where's his spirit? Adult Tuvok thinks this kid is delusional and disrespectful.
Chakotay: Child Chakotay thinks it's unthinkable that Chakotay turned his back on Starfleet and is angry and devastated by the news that his father died fighting instead of giving in to the Cardassians and evacuating his home. He calls the decision and the man stupid which angers Adult Chakotay, hence the beef. Similar to B'Elanna, being able to talk it out with himself is healing. Remembers things about his dad he's long since forgotten about.
Neelix: Adult Neelix is crying and hugging child Neelix and telling him to please please please cherish your family, spend as much time with them as you can. Ashamed of what his life's become. Does NOT tell child Neelix what happens to his family, doesn't care that this won't actually affect the timeline in any way - wants to preserve his happiness.
Seven: Baby Seven has a lot of questions that Adult Seven doesn't know the answers to. Much younger than the others' childhood selves. Baby Seven doesn't really understand why the situation's as sad as it is.
Tom: Trying to appear cool and suave in front of his childhood self and this works well but then Kid Tom does something that annoys Adult Tom and after scolding him he says "C'mon don't be so sensitive kid-" and both Toms remember their dad at the same time. Not fun Not fun Not fun!!
Kes: Kid Kes thinks she's so cool for achieving their life's dream and going around on a STARSHIP and having awesome powers and WOW WOW WOW!!! They're just buds.
Janeway: Kid Janeway thinks Adult Janeway's pretty ok...wishes she was a scientist but being captain's alright too~! Janeway likes the little scamp. Gets a bit wistful when she talks about her dad but doesn't tell her he died, similar to Neelix. Would lie if asked.
Harry: Kid Harry thinks adult Harry's living the DREAM and wants to hear ALL ABOUT his adventures!! Similar to Kes, kid Harry brings about no conflicting emotions and uncomplicatedly adores adult Harry. Like Janeway, Harry gets wistful when his parents are brought up but they're both still alive so it's not as serious! Tells kid Harry to appreciate his parents more. You love them a lot, right? Right!
The Doctor: He has no childhood. Please imagine he gets jealous and tries to make a child version of himself but it's just a shrunk down version of current him with a propeller hat, suspenders, and giant lollipop.
