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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 opposite personalities, yet they have a good relationship. Happy would constantly annoy Grumpy with his loud music, and sometimes Grumpy's sarcastic remarks on his music would be flying over Happy's head.
In "Whose Voice is it Anyway", it is shown that Happy constantly sang loud music, making Grumpy more annoyed than ever.
Bashful and Happy would get along okay, since Happy would give advices to Bashful to make him feel fine.
He and Queen Delightful both have energetic and eager personalities. He would also make sure to the Queen that her problem would be solve in no-no time.