Thor and Loki have a good relationship that is not lacking of good old brotherly banter. Previous to Thor’s coronation, Thor calls Loki “cow” because of his helmet. Since Thor’s helmet has feathers, Loki calls him hen or simply clucks at him when he sees him.
Coulson was reincarnated when he died. 10 years younger than Shanta, they met when she was volunteering at the orphanage. She got him a Captain America doll when she realized how much he idolized Steve (and named him “Cappy”). One day, Shanta got the Avengers to come with her and she introduced them to the reincarnated Phil Coulson; needless to say, it was a very emotional moment — and Tony had the paperwork processed ASAP.
When Bruce ends a message to someone he cares about he always puts two kisses at the end, one little x and one big X. So the person who receives it knows that Bruce loves them as himself and as The Hulk.