um... no!
While I was looking at both Luffy and Spinel's powers, it's no doubt they'd be brothers or even cousins. I used the scene of the SpongeBob episode "Can you Spare a Dime?" for this scenery. Hope you enjoy it!
Luffy (C) One Piece, 1999-2021
Spinel (C) Steven Universe, 2013-2021
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um... no!
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