Reminder re: EMIYA (Assassin): Assassin day this week is your next best chance to pick Kerry up. With only three SR Assassins including him, there's a pretty good chance if you can get the SR roll in the first place, and the next rate up with him is the next Class-based gacha in about six months. That said, the other two are Stheno and Carmilla, two gals who love to spook you.
Also a very good chance to pick up Jack if you desire crits for days, because she only shares the SSR tier with Jeanne; and the next time this gacha rolls around, there'll be Gorgon and Lobo also clogging up the SSR zone.