Headcannon time
Douxie is a wizard therefore he can do whatever he wants and I can write him breaking the laws of reality/physics.
Headcannon: His tattoos can shift and change.
One I think his tattoos are runes that help with his magic similar to his bracelets. Two his tattoos can change BECAUSE I refuse to believe they don't have some kind of cool spell cast on them that allows them to change shape, size, and pattern depending on the magic he's casting. Three art and runes are often deeply affiliated with magic.
In conclusion I believe his tattoos help with his magic, allow him to express himself and connect to his Camelot heritage and magic culture, and the thought of moving tattoos is really cool so you can pry this headcannon from my cold dead hands.
Any thoughts to add?











