Lord of the Old Civilization (NPC)

Name: Rosyuo
Age: ???
Gender: Male

Ace Card: Number 77: Seven Sins
Deck Type: "Sins of a Different World" (別の世界の罪) - Monsters of a different dimension. Different Dimension Demons also known as D/D/Ds; which Xyz summon, Fusion, Synchro summon, and Pendulum summon their other worldly superiors.

Overlord Skill: ''Power of the First Sin'' (まず罪のパワー) - You do not take effect damage; you may still activate effects that would meet the requirements for effect damage, i.e, Leonidas or D'Arc. Once per turn, you can add 1 Covenant and D/D card from your deck or graveyard to your hand. Once per turn, you can add 1 Pendulum D/D monster from your extra deck or graveyard to your hand, then target 1 card on the field; banish that target.

1. If you have ''The Golden Apples'' card in your hand, you may activate it from your hand during either player's turn; apply this effect instead when you activate this card; negate the effects of all other face-up cards currently on the field until the End Phase. Also, negate the effects of all other cards activated this turn, and if you do, return them to the state they were at the start of this turn, until the End Phase. After you activate this effect, only you can choose which cards on the field can activate their effects, until the End Phase. Instead of sending this card to the grave after activation, set it to your field. If it is destroyed by a card effect, set it to your field. This effect cannot be negated.

2. If you have the ''Apple of Enlightment'' card in your hand, you may activate it from your hand during either player's turn; apply this effect instead when you activate this card; Until the End Phase, each time a card is activated or summoned, gain 3000 Life Points. Instead of sending this card to the grave after activation, set it to your field. If it is destroyed by a card effect, set it to your field. This effect cannot be negated.

3. You cannot activate skill 1 and 2 if your opponent is an Overlord.

Personality:

This is literally a spoiler so I advise you don't click unless you can trust yourself not to meta:

(This character's information will be unlocked as the story progresses.)