While it has yet to be addressed in After the Tone proper, Ingo maintains a habit of casual sketching; it helps fulfill and cope with a new compulsion to create.

Drayden and his Altaria, as mentioned in A Glint, A Spark.

Prior to his time in Hisui, Ingo wasn't one for colder climes. After the fact, he'd still prefer not to spend too much time out in the cold, but can weather it with much more grace. On the other hand, his ability to tolerate warmer weather has lessened, having become accustomed to Mount Coronet.

This was the first pass at designing a midpoint between human and Arceus forms.

Second try at a midpoint between forms. This isn't necessarily canon to After the Tone, but fun to design.

While the midpoint form might not be canon, constellation Sneasler is, and this is a quick look at her.