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A sidekick (usually some kind of animal) who, unconditionally, is extremely loyal to you. You have done nothing special to earn this loyalty, it just really really likes you.

From the relationship between Hibari and Hibird from Katekyo Hitman Reborn
Person 1: Dude why does that dog keep following you?

Person 2: He's my hibird

Person 1: Ohh
by Chrissy-chan October 15, 2009