User blog comment:Hitsuji Mamoru/FGO-style Servant Creation Room/@comment-27971189-20170120163621/@comment-27971189-20170121073903

Type-Moon universe have Seimei and Tamamo at same era, they goes with popular belief that its Seimei who exposed Tamamo identity.

Tamamo herself do trash-talks him in Extra. IIRC, Fox Tail have Tamamo implied Seimei is a bishonen with terrible personality (unlike Merlin who is playful, he is more like an evil person).