The Necromancer's Second-Dimensional Chat Group

Vertin: "I'm your Timekeeper, so do you want to run away?" Skadi: "Weren't we supposed to be Abyssal Hunters for life?" Xia Die: "There is no boundary between one death and another. You said that yourself, sir." Ji Lyman: "The Empire has already split in two. We need to found a Second Empire!" Necromancer Wanci: "At first, all I wanted was to escape from that prison."

1999 -> Arknights -> Honkai: Star Rail -> Warhammer 40K (with an adorable little sister as regent).

This is a lighthearted and fun story (thumbs up).