>>3154292Depends on what aspects of Ruri you like.
It's hard to think of any character that has so many lovable aspects as Ruri.
First thing I can think about is off course Eromanga Sensei.
Elf and Muramasa both have different parts of Ruris personality while adding a few new things.
When you like her because she is a small tsundere ish girl with hime cut and lolita dress you can find some other girls that have similar traits.
Victorique de Blois from Gosick or her mom.
Maybe Panty from Panty and Stocking.
Also maybe Shinku from Rozen Maiden or Dalian from Dantalian no Shokan.