Danny views Nick as pure property, or some sort of exotic and rare animal. Despite this, Danny often degrades Nick in any way he can, as a way to get out his anger towards Nicks father. Danny uses Nick as a tool for his own benefit.
Despite Nick creating her, Nick views Ellie as sort of a mother figure; kind, tender, and caring. He does his best to ensure she's always functioning properly, and would kill for her. Literally. He's done it before.
Nick view's Gigamigo as his literal guardian angel, and worships him quite often. Despite Nick viewing Giga as holy, he also realizes he is responsible in part for Giga's health, and takes care of him well.
Gigamigo is a big ball of love, so when he noticed that Nick was suffering, he did what he could to brighten the boy's mood. Eventually he became stuck to Nick, being too loyal to ever leave his side, no matter what.
Ridley cares for Copepa the best he can, constantly encouraging her to move in with him instead of remaining in the dumpster that she's currently living in. Despite this, he provides for her basic needs, such as food and warmth.