Their faces telling me what they were probably thinking:

No such thing as an accidentally attractive character. Yes, even those supposedly made attractive mostly by fans, like Renamon. She is based on the Japanese Kitsune Yokai, who is described as:

"Common forms assumed by kitsune include beautiful women, young girls, or elderly men. These shapes are not limited by the fox's age or gender, and a kitsune can duplicate the appearance of a specific person. Foxes are particularly renowned for impersonating beautiful women. Common belief in medieval Japan was that any woman encountered alone, especially at dusk or night, could be a fox. Kitsune-gao or fox-faced refers to human females who have a narrow face with close-set eyes, thin eyebrows, and high cheekbones. Traditionally, this facial structure is considered attractive, and some tales ascribe it to foxes in human form."

Yo-Kai Watch also has a take on this with Kyubei, although he is male, but actually aware of his beauty.

So, yes, developers and creators certainly know what they are doing on these instances. Always. All according to plan.