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Just realised I also didn't answer the thread question yet.
To be honest, I don't interact much with the fandom so I don't really know common headcanons. One thing I did notice in both fanart and fics is that people describe or draw him as tall... But truth is he's a bit of a manlet. And I love my short king. Probably not intentional from GF but it could also be a hint towards the neglect from his childhood and not getting fed properly.