Uri Reiss

The late Uri Reiss was the brother of Rod Reiss and uncle of the late Frieda Reiss. He inherited Titan powers and memories of the world from his and Rod's father by eating him in the succession ritual of the Reiss family, who is their world's true but covert royalty. Frieda later ate him in turn and inherited his powers and memories, which she later lost to Grisha Yeager during Grisha's attack on the Reiss family.

Uri also inherited the ideology of the very first Reiss King, who built the Walls 100 years ago and wiped out the memories of most of humanity. As Rod attempts to pressure Historia into injecting herself with Titan serum, he says that, initially, he and Uri pled with their own father to free humanity from the Titans. Their father refused to do so or to explain why he would not. However, after Uri consumed him, Rod could tell by his eyes that he had also inherited the same ideology. Before he'd volunteered to take on that burden, Rod claims, Uri "entrusted me with a mission of my own in exchange": to pray.

Rod states that, having become the sole creator and ultimate governing force of this world, "an all-knowing, all-powerful being," Uri had become God, with the fate of humanity in his hands. As Historia still resists his attempt to inject her, he tells her that his mission is to summon God back into this world and devote his prayers to it. (Historia, prompted by memories of Ymir telling her to live for herself, violently resists her father, throws him to the ground, and calls him a liar.)

Kenny Ackerman, who has been serving Rod for years, is actually still loyal to Uri, even though Uri is long dead. When Rod says to Kenny that he never understood why his brother would have taken "a dog like you" off the streets, Kenny threatens to kill him if he ever speaks ill of Uri again, not seeming to care about the insult to himself.