@GoldenSunset-o8n

Even water has shadows. Which is why Teyvat has its own "laws".

@AlexandreLemyre-x4n

furina main inside me is crying

@stormyjam466

Because you can't see elements through the shadow see how mozis (gameings pet) fire doesn't show up

@joyhammer3148

Elemental energy, CQFD.

@Mika-san-e3t

This made by hydro element through her vision no physical touchable for anyone else like how she can walk on water so no shadow 
Hope this helped

@yukiasa123

This is a water

@imlonly173

Me and my imaginary friends😂

@m4ster_t1ghnari

" Teyvat has it's own "laws". "

@leventecsucs9024

Furinas pet is created by her vision. Thats why u cant see it

@AyaniShah

Plot twist: Furina lived so long that her pet died and that is its ghostƪ(‾ε‾“)ʃ

@ChrysosHeirsPhainon

Wait a minute, i swear i saw this video before

@anet.by1

And I know why these pets are not visible because they are made of water.

@DarkLord412-dl

Because they are made of pure elemental energy. Even gaming's pet don't have shadow on its pyro parts and Oz also doesn't have a shadow

@JeanMDS

Because water can refract light and reflect light.

@ITZEE7673

is she imagining them 😭

@Peaceeeeeeoutttt

her pet died, thats why

@SahebGiri-v4c

Main answer is, she uses her spiritual pet from vision that's possible by Focalor blessed.

@SomaSchiffer

Bro looked so deep without remembering that Furina literally uses water....

@Nil_Sama

Hydro and water are two different things. Furina's pet is made purely from hydro. Water has a shadow, but hydro, wich is split from the light element doesn't give off shadows, because light doesn't give off shadows. Yes, she created her pets in her mind when she was all alone, but her vision gave them life.

@arnobes2235

Ever seen water having shadow