I’ve updated this in an easier to read format (using the provided template) and fleshed it out more.
Knight (Unique)
Blue Dragon, Killer
Goal: Eliminate all Unseen, Cult, and any Neutral Killers.
Passive Ability 1: Royal Defender
If two members of the Blue Dragon who have Royal Blood are killed, you will commit suicide. (If the second death occurs during the day, you will not be able to use your abilities that night and will commit suicide at that night’s conclusion).
Passive Ability 2: Oath of Loyalty
Immune to conversion as long as all living court members with the Royal Blood passive remain aligned with the Blue Dragon. Once a Royal Blooded member has been converted, immunity is lost.
Night ability 1: Patrol (3 uses)
Visit someone, guarding them if they appear to be a member of the Blue Dragon, and attacking them if they appear to be Cult, Unseen, or Neutral. Cannot target the King.
Night ability 2: Command The Troops (2 uses)
If the King uses his Guards! ability, his target will be revealed to you and you will be immune to death.
I think this would make the Knight a lot more fun to play. Obviously the Patrol ability is very powerful, so the Knight becomes a unique class in this case, and it has limited uses. It also fits the persona of a Knight to have his objective somewhat tied to the Royal Blood passive, and gives him a fairly easily exploitable weakness.