Kyousou Giga (TV), Bakemono no Ko Recommendations
Both are stories about parents, and family, and loss and strength, and growing up and learning how to make a place for one's self to belong. They're both really touching and they have similar fantasy settings, along with a good dose of nicely done action.
. The characters both go to a world different from their own
. Surrogate father figures
. Really warm family atmosphere (less in Kyousougiga than in the Boy and the Beast)
Kyousougiga is more of a "think for yourself" anime (some things happening are not explained on purpose) when the boy and the beast is more straightforward. (It's a good thing because that way it can be watched by more people.