Frost's Links
Frost loves August very much. As the only person Frost has ever met who can read the Pixi's emotions, Frost is always very touched when August is able to respond to his feelings appropriately without having to ask.
Augustine is probably one of the only people who can tell how Frost is feeling from just a look. Maybe it's because August has done so much research, maybe it's because August himself usually has a stern face. Whatever the reason, he has no trouble seeing and interpreting the tiny changes in expression and body language that Frost displays.
While Pixie, like everyone else, can't tell what Frost is feeling by his expressions, he really appreciates that she puts in an honest effort to understand him. He doesn't mind her frequently asking how he feels, because he knows that it's because she cares and doesn't want to upset him by misreading his mood.
Pixie loves her adoptive sibling dearly, and doesn't mind that Frost doesn't know how to show his emotions. She may not always know what Frost is feeling, but she tries her best. She got into the habit of asking him how he's feeling, so that she always knows even if she can't see it.
Frost loves the three-headed Floop just as much as he loves the rest of his family, but honestly Cerberus is probably the one that frustrates Frost the most. The Floop just NEVER gets his mood right, and thus acts inappropriately for the situation. Frost doesn't necessarily hold it against him, but it still annoys him whenever it happens.
All three heads love Frost, but the little Pixi confuses them greatly. When they think he's happy, he says terse words. When they think he's sad, he talks excitedly. They can't figure the little guy out, though that doesn't stop them from trying.