Okay so just with the new promotional picture, @ttachibana and I wondered, don’t you feel like Red has hair closer from Past!Allen than in the manga?
Hallow!Red: (source) (Some hair is pulled bak, but there’s a lot of hair loose)
Manga!Red (while some hair is loose under the ponytail most of it is in the ponytail)
Past!Allen (some Hair pulled back, most of it in loose)
I suppose it’s to put more focus on Past!Allen. While the Manga version mostly seems like Red doesn’t really take care when he ties his hair, the Hallow version seems to really have stylized it with Past!Allen in mind.