So i want to put it out there, although extremely unlikely(or is it)..
The reason Oda has shown a lot of Norse mythological creatures is not to rule out Loki's devil fruit, it's because he will be able to
Shapeshift in all of those creatures at will..
Loki's devil fruit could be..
Logia Light Light fruit Mythical Model Rainbow..
Loki's a Leprechaun God, Trickster, Shapeshifter, Vanishing invisibility, Gold manipulation, giving Golden Chestnuts to Squirrelnir to trick him for his eternal loyalty..
Would make sense if those Sunstones(painters) were created and left behind by the previous Leprechaun God so the Giants could use them to sail on Rainbows..
'' The leprechaun, a tiny elf from Irish folklore, is said to love gold coins,
shamrocks, rainbows and anything green ''..
Loki in mythology is also a Shapeshifter..
The more you think about it, the more it make sense?..