So MCU wise I've got Bruce and Frigga. You know Bruce. Come join Avengers Dads. Frigga liked the last Steve for the most part and I can't imagine she won't like Kate??
I also have Steve Trevor here whose girlfriend used to almost-but-not-quite date old Steve. Oh, and there's the Captain Steve who died heroically via airplane during a war thing. That's something.
Ummmmmm. Those are the ones who immediately affect your newbs but I am sure we can find more shenanigans to get up to. Kate and Rose always did well together before!