I searched a topic about easter egg (and possible easter egg) to typeMoon in other works and I didn't find one, So I create a topic about it, because there was some characters and moment in some anime who gave me the feeling the writers or director were fan of Fate.
Here are my contributions:
Amor no Pisces in Saint Seiya Omega.
for me it's impossible that the character don't take inspiration from Gilgamesh both by his personnality, his power or his design, especially when Saint seiya Omega use also Medea as a character from the show and the main antagonist of the season is
Spoiler:
this fight from Smile Precure always gave me some UBW vibe.
between the fact the character summon many sword at the b fight all the fight using sword she created or the fact the whole fight is about the future of the character and that following her future path would be hard.
As Yuji Yamaguchi left Deen to work at Toei animation just after UBW movie(with Chiaki Kon, director of Higurashi, hard time for Deen) and made multples episodes of this season of Precure, I think it's possible that will be a reference to UBW.