This is just my two cents on the matter.
Head of State (Passive) - Your vote counts as two until you use Decide Fate, and you can talk at all points in a trial. If you are the starting Good King and you are executed, members of the Blue Dragon with royal blood will no longer gain extra votes to be King.
Tenacity (Passive) - Immune to being occupied at night and immune to target changing. If you are the Psychopathic King, this ability also makes you immune to death at night.
Decide Fate (Day) - Decide the fate of a player on trial. This removes the extra vote from your Head of State passive permanently. (1 use)
Royal Finger (Day) - Resets all votes. Only you or your target may be voted for the rest of the day. (2 uses)
Hide (Day) - Neutral King exclusive. Nobody will be able to visit you tonight, regardless of immunities to occupation or preventions. (2 uses)
Guards! (Night) - Have a guard protect you tonight. You will be immune to death tonight. (2 uses)
Order Execution (Night) - Psychopathic King exclusive. Send a guard to kill a player. (Infinite uses)
Starting King exclusive powers (these replace the standard Guards!):
Assist (Night) - Send guards to protect your target from attack, making them immune to death, occupation, and redirection tonight.
If you are the starting Good King, this also protects your target against conversion.
If you are the starting Evil/Cult King, you have an extra use, it makes your target appear as Blue Dragon to investigations, and you may target yourself. (3 uses)
Guards! (Night) - Starting Good King exclusive. Have a guard protect you tonight. You will be immune to death tonight. (3 uses)
Allies (Night) - Starting Evil/Cult King exclusive. Discover if a player is a member of your faction. (4 uses)
It’s simply my opinion on how King should be, taking some suggestions by others.