How can I pick just one? DDDDD: Well... going by the anime only, it's probably Guilmon in Tamers - not only is he very, very cute, which is impressive considering they had to work with a big muscly dinosaur thing, he's maybe the first Digimon in the anime as a whole to get a proper development arc of his own instead of primarily revolving around their partner. (And it's a good one, too!) Culumon, Tamers Terriermon and 02 Armadimon get honorable mentions because they're not quite as adorable. Design-wise (and these are off the top of my head): the rest of the Guilmon line, Renamon's line, DORUmon's line, Gabumon, Culumon, MetalGreymon, Gaioumon, most Agumon evolutions, Mugendramon, Tsukaimon, Ryuudamon, Raptordramon, Grademon, Megadramon, Darkdramon, Unimon, Rukamon, Yatagaramon, Crossmon, Hououmon, Tailmon, Quetzalmon, Thunderbirmon. Plus pretty much everything else that has "dra" in its name and/or looks like a dragon and/or looks like a badass bird of prey and/or looks generally awesome, because I'm actually a ten-year-old boy.
Day 02: Favourite character.
Day 03: Which digivice do you like best?
Day 04: Favourite digital monster.
Day 05: Favourite crest.
Day 06: A couple you wish existed.
Day 07: A couple you can’t stand.
Day 08: Favourite couple.
Day 09: Favourite friendship.
Day 10: Favourite season.
Day 11: Who do you think wore the goggles best?
Day 12: Least favourite digital monster.
Day 13: Least favourite character.
Day 14: Least favourite season.
Day 15: A character you’d be best friends with.
Day 16: A character you would not get along with.
Day 17: Best dressed character.
Day 18: Worst dressed character.
Day 19: A moment that made you happy.
Day 20: A moment that made you sad.
Day 21: A moment that made you angry.
Day 22: Favourite villain.
Day 23: Lease favourite villain.
Day 24: Favourite minor character.
Day 25: Favourite episode.
Day 26: What crest would you have?
Day 27: Would you ever have a Digimon for a pet?
Day 28: English names vs Japanese names (Which do you prefer?).
Day 29: Favourite quote.
Day 30: An unpopular opinion.