Just an idea ... a mod where you could retire your main character. Have them spend the days in their house with their spouse, or walking around town like an NPC. You could start a new character and visit them, steal from them, get quests from them, or even recruit them as your follower. You could assasinate your old good character with a new evil one, or hunt down your retired vampire character as a new dawnguard character.
Posted this on reddit, it seemed popular and someone suggested I post it here. Thanks!