You just put me on the spot!
It's been a while since I've watched Appmon, but I still remember most of it. As to who my favorite character is... All of them! After watching the final episode, every one of the main characters was so great, and I loved them. And the monsters themselves...!
If forced to choose, Musimon is my favorite of the Appmon. He was so adorable. I loved his voice, the way he acted, and his evolutions. As for the human characters, it's really difficult to choose. I'll probably just say Astra because my favorite human characters in any Digimon series tend to be the blond characters (and if they wear hats, it's even better!) And Astra's storyline shares something in common with my own Digimon OC. But Haru and Yujin are very close behind.
And I have to toss some love towards Bootmon, especially when he escapes. "BOOOO~T!" makes me laugh every time I hear it.
Now I want to watch Appmon again even more than I did before. It's my second favorite Digimon series!
Who are your favorites?