Spirited Away AU

Spirited Away AU is a popular AU (Alternate Universe) within the Rise of the Brave Tangled Dragons fandom. In the AU, Rapunzel, Merida, Hiccup and Jack Frost play roles from Spirited Away. This can be considered an offshoot to Studio Ghibli AU.

Hiccup Horrendous Haddock III
For Hijack he's cast a male version of Chihiro or as Haku with Toothless as his dragon form.

Jack Frost
Fans have cast Jack as the homeless River spirit, Haku as he helps a young human girl survive the witch of the bathhouse (for sirits) clutches until he could return her and her family home.

Rapunzel Corona
Rapunzel is portrayed as Chihiro Ogino (Sen when the witch changed her name), as she works for Gothel as  Yubaba so she wouldn't turn her into a pig and until Gothel's apprentice, Jack comes back to set her free.