Don't You Die on Me! by @Lucky_Ladybug66 (Daisy Hunt)

I love the Seph and Zack friendship in FF7, so for KH, I decided to bring Zack in and craft a backstory. (Zack should be in KH!) They were in the military together, as their counterparts were, and Seph eventually started traveling down a path of darkness (dunno what he did, but I don't imagine it being anywhere as serious as what FF7 Seph did, albeit poor FF7 Seph was out of his mind). Zack was always determined to help his friend to leave that path behind, and according to him, Seph almost did, but he was killed before he fully did.

The irony of KH Seph's death, as I realized after I came up with the method, is that during a battle in war, he's impaled through the stomach. And of course, that's how FF7 Seph killed Aerith.

The blue feathers falling down are a symbol of Seph's fate following his death.

And I drew Zack from memory. Hope I got him right! was using the Advent Children design as a guide.