Asking on behalf a friend. They just got burnt by a harem series that started out silly and fun, but the harem ended up including the protagonist's cousin, another character's mother and then a loli character (who was 18) and her now-loli grandmother. Just too creepy and uncomfortable for them at that point, and those particular tropes can be... kinda all over anime.

So, we're looking for lighthearted comedy series that don't feature incest or romance with loli characters. My friend did say that they're okay with some fan service, and that they'd prefer a cute art style rather than realistic. Doesn't have to be a harem series either, just lighthearted and fun. My tastes lean towards more serious, dark or action-y works (in part because some of these tropes are so dang common), so I can't recommend much to them.

I did recommend The World Only God Knows and they said it seems right up their alley, and they also said they'd check out Kaguya-sama: Love Is War. So that could help as a reference.