Aries Mu- Shun knows Mu from his world, although this Mu is different from the one in his reality. For one thing, this Mu is alive. And comes from a world where all the Gold Saints survived. But it's Mu, so Shun trusts him and respects him. He's also grown to like Mu, and is very thankful that the Aries Saint is helping him learn how to heal. Shun also still feels bad about making Mu cry that one time.
Scorpio Milo- Another Saint Shun knows from his world, although from a different. Although Shun doesn't know him very well, he still trusts Milo because he's a gold Saint. And cried when Milo died in the Holy War.
Aquarius Camus- Yet another Saint from Shun's world. Only really knows him as 'Hyoga's Master'. Trusts him because he's a Gold Saint though, and sacrificed himself.
Crane Yuzuriha- Silver Saint from the Holy War two hundred years ago. Trust worthy because she is a Saint and is a Lemurian like Mu.
Ryugu Rena- Thinks she a sweet kind girl. But is worried about this Oyashiro-sama she mentioned. If it really is a evil god he feels he has to do something about it.
Li Shenshun- Seems like a nice person to Shun. They have the same appetite! Also, he seems to be able to shock people.