Father: Shinjuro Rengoku, former Flame Hashira. His hairstyle looks a lot like Pikachu's.
Eldest son: Kyojuro Rengoku, current Flame Hashira. His hairstyle looks a lot like Pikachu's.
Second son: Senjuro Rengoku, with no talent for swordsmanship. His hairstyle looks a lot like Pikachu's.
Third daughter: Hohana Rengoku, with red hair and red eyebrows. Well-read, sensible, gentle, adorable, noble, aloof, dignified, and elegant. Of course, she doesn't look like Pikachu at all.
Demon Slayer → My Fan Club Academy (discontinued) → Arknights → Hunter x Hunter → Honkai Impact 3rd