>>74537They are, and that's because they're bottom of the totem pole Youkai and it emphasizes the whole reverse theme of DDC. You can't be a twat if you don't have the strength to back it up in Gensokyo.
Now that you mention it, I think what holds DDC's characters back is because they all fall into separate camps which aren't individually strong, and that DDC was a bit weak for a mainline game. Seija and Shinmy are an iconic duo and get a follow up game, but everyone else falls into the realm of background mobs except maybe Raiko due to her being extra stage. You got small time grassroots Youkai, the forgettable Tsukumo sisters, then the aforementioned big characters, and then Cirno again. Compared to LoLK after DDC which has very memorable characters, and the previous TD which has the Taoists which rounds out the last major religious faction, Mamizou (who needs to get the fuck out of Lotus Eaters god I hate her so much), and several returning characters.
As far as nice and kind people go, you kinda have to dig for them as most characters are some degree of sassy asshat.