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—From The 7D Mine Train game app
Happy is, like the other dwarfs, very short in size. Unlike the "Snow White and the Seven Dwarfs" version, Happy is pot-bellied, but not the plumpest of the dwarfs. Happy has peach colored skin and wears a yellow long-sleeved shirt, an orange vest with a red flower on the left side, brown trousers, gray shoes, and a pointy green polka-dotted hat with a red ball of fuzz on top. He, like Grumpy, Doc, Bashful, and Sleepy, sports a beard. He is the first dwarf to sport a blond colored beard, the second being Doc.
In his prototype appearance, his appearance looked like his current appearance, with only more dots.
In the episode "Once in a Purple Moon", Happy becomes a werewolf when the moon turns red. He becomes a werewolf again when the moon turned rainbow. He has a typical werewolf appearance, with his orange blazer and his green polka dotted hat.
Happy's behavior is very optimistic and cheerful. In fact, unlike his original counterpart, who's merely mellow, jovial and friendly, Happy is hyperactive. He also cheers up the other dwarfs whenever they have a problem. He usually chooses the right time to play a song on his guitar (harmonica in "The Long, Long Winter") which irritates Grumpy to no end. He doesn't like feeling anger, as shown when he nearly snaps at Goldilocks for destroying his guitar after defending her previous times ("Goldilocks and the 7D").
He's a little on the naive side, a little too trusting of strangers, as shown when he was fooled by the Glooms' disguise in "Welcome to the Neighborhood" and kept insisting that Goldilocks be given a chance in "Goldilocks and the 7D".
He also has a terrible grasp of sarcasm, as shown on multiple occasions where Grumpy would make a sarcastic remark and he doesn't pick up on it.
In "Once in a Purple Moon", when Happy becomes a werewolf, his happy demeanor turns into a savage werewolf behavior.
Grumpy and Happy have two different personalities, yet they get along okay. He annoys Grumpy constantly with his singing, and sometimes Grumpy's sarcastic remarks fly over Happy's head.
They don't have full interaction in the series.
He and Queen Delightful have very similar personalities so they get along very well with each other.