You are,
Master of Ruler
Survivor/Savage Two-Shot Flavour Cop Discriminating Killer Survivor/Savage - Outlive all other Masters with EXTRA-class Servants, eliminating at least 2 yourself with your [Killer] ability. EXTRA classes are defined as classes that are beyond the scope of the Normal classes. The Normal classes are Saber, Archer, Lancer, Caster, Rider, Assassin and Berserker.
Two-Shot Flavour Cop - You may investigate a player, and will receive their flavour name (Master of ???), as well as the true identity of the Servant they possess. You may use this ability twice, and not in the same night that you use Killer.
Discriminating Killer - You may kill a player every Night Phase. This ability will fail on all non-EXTRA class Masters, and this restriction cannot be bypassed via Command Spell.
Command Spells: 3 -During the Night Phase, you may make every action you take gain "Unstoppable", making it immune to failure. Cost - 1 Command Spell
-During the Night Phase, you may give yourself the passive "Untouchable", making any action that targets you fail, including those that are "Unstoppable". Cost - 2 Command Spells
Once you run out of Command Spells, you will lose access to any ability to may possess. You will, however, still be able to use any factional abilities you may possess.
Servant Information: True Name: Caren Ortensia (Amor)
Alignment: Lawful Good
Gender: Female
Description: When Rulers are summoned in a Holy Grail War, they are intended to serve as mediators between factions, to ensure the rules of the war are upheld. Caren, as a Saint, qualifies for this class due to her acts in service to the Lord, which includes consummation with all the evils in the world, given form. To reach the Throne of Heroes, and thus be summoned as a Servant herself, she has been fused with Amor, the Roman God of Love.