I've added fears based on character values.
Plus I have added fear of being cured to vampires. The reason for that is that sims with a cure can Slay a vampire, initiating a fight. When the curer wins the fight, they'll throw the cure at the vampire and cure them. Other life states cannot be cured by other sims with force.
Though I could propose a new fear that could apply to all life states sims can become and be cured of:
Fear of Being a Puny Human - After seeing how much can this sim scare and torment normal humans, this sim has been left feeling that being a normal human again is terrible. These sims will try their best to not be cured and should they somehow get cured, they'll fear other life states more.
Edit. I momentarily thought of Fear of Underground Tunnels (from Werewolves game pack), but that work could be done by the existing Fear of Darkness. After all, most of the problems happen there because it's dark.