[@Altered Tundra] I was thinking about Elecmon briefly. But I figured he would be a character that we would find as an NPC if we went to the Digimon Nursery place from the first season. So I didn't want to steal that potential storyline.

I have my line limited down to two options. Assuming you don't mind different digimon. (Was going to go for similar archetypes and characters to help with a similar feel of the first season.) was going to choose (from child to mega)

Muchomon - Diatrymon - Yatagaramon - Kuzuhamon
(Mostly to fit aesthetically.)

But I figured I'd give time to discuss if the other (Inkarnate's) character wanted the bird digimon. In which case I'd go with my other choice.

Kudamon - Reppamon - Tyilinmon - Sleipmon