Tony:
Bruce (because he is also scientific)

Steve:
Bucky (you spent a lot of time with the Barns family and he is the dad of one of your best friends and is also athletic)

Natasha:
Loki (he is sassy, magic and a trickster)

Bruce:
Tony (he is scientific and sarcastic)

Clint:
Natasha (she is a badass and visits a lot, it so Aunt Tasha)

Pietro:
Thor (He is a god and you also like Pop-tarts)

Wanda:
Clint (He is a prankster and you don't do them much so it is fun when you can. Also he can be a good mentor)

Loki:
Wanda (she is a bad ass witch, slightly similar to your dad, but not as awesome)

Thor:
Pietro (He is fast and funny)

Bucky:
Steve (Spend most time with them and your best friend is his daughter. Plus ha is athletic like all four of you)