And it fits, too. Both go through stuff (Yukari through reality, Seiga walls), Both get their Miko to do stuff (Yukari gets Reimu to solve a few incidents [IN, SA], Seiga gets Miko to go Taoist), Both are wicked hermits (Yukari by job description [she's a schemer who lives away from everyone else], Seiga literally), And both have servants that they use in Spell Cards (Yukari plays Ran-pong with you, Seiga has Yoshika assault you).