I think you’d have to change the goals of the game based on whoever last positively or negatively interacted with him. Something like “+Military attack vs. the last player with a negative interaction; -Military attack vs all other players,” where the bonus is ever changing.
It seems like he’d have gold earnings at the cost of reduced production domestically. But also some push-pull, like every 50 gold generates 1 unhappiness, with costal cities generating twice as much unhappiness.
I’d want to see some other dice roll mechanic that changes the Civ every 2-3 turns. It would probably be something around culture, but now the character’s mechanics are a little crowded.
For units, it appears they’d use a battleship that’s a complete disaster and not actually helpful. There’s probably also something like a priest / culture bomb unit, like you can send an influencer which causes unhappiness in other states when it gets to a city (sort of like a spy).
Oceania was at war with Eurasia; therefore Oceania had always been at war with Eurasia.