Hmm... I think he's quite gregarious, and a bit playful, even fun-loving, but in that sort of composed, dignified way--absolutely the type to make teasing comments with a calm, gentle smile. He's a bit of a pleasure-seeker first and foremost, and takes quite a bit of that pleasure from novelty... He's always seeking out new experiences and knowledge. To him, the worst things you can be are boring or apathetic.
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I feel like that's a good start?