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Director of the Librarians, Hamutz is considered the most powerful Librarian in the world.
Hamutz has a lot of things under her b...her belt. She's the Acting Director of the Armed Librarians. She has powers that include the ability to douse a large area with invisible sensory threads and using them to toss small rocks like bullets with almost pinpoint accuracy. She likes sowing bunnies on things, including the white button-down shirt that partially covers her enormous bosom. She can also survive a drop from a plane without a parachute. On top of this, she has very few qualms about killing people, even wiping out entire platoons or convoys of army troops, up to the point where the previous Director of the Armed Librarians once asked Mattalast to kill her before she became too powerful.
As leader of the Armed Librarians, she often throws those under her employ into dangerous situations, despite already having most of the information in mind. Very rarely does she take direct action unless she perceives it as necessary. But when she does engage in direct combat, the enemy usually does not survive.
Volken discovered evidence that Hamyuts was the one who really blew up the Silver Smoke back at the beginning of the anime and caused hundreds of Meats to drown in the see. He thought to use his discovery to expose her as a fraud in front of the whole Library. However, it turned out that crime was merely the tip of the iceberg.
When Hamyutz confronted Volken face-to-face, she revealed that the Library of Bantorra and the Church of Drowning in God's Grace merely pretend to be enemies, but in reality the two groups are one and the same. The Governor of Paradise who rules the Church is actually chosen from the ranks of the Armed Librarians, and even her predecessor Fotona(?) supposedly knew this as well. It is not quite clear what her true intentions are, but current speculation is that this fake war is an excuse she uses to feed books of various shape and size to some sort of tree from Paradise.
In one episode, it was revealed that she was the girlfriend/lover of Mattalast for awhile, as he was the only person she met who could keep up with her attacks without getting hurt. It helped that Mattalast holds the ability to see a few seconds into the future, so that Hamyuts couldn't quite hit him with her thrown rocks, but she could use them to block Matt's return fire. When Matt was a mere trainee Armed Librarian who liked getting drunk at bars, he ran into Hamyuts there and the two of them hit it off. Even when she was slaughtering entire bases of armed soldiers, Matt said nothing in opposition.
As of now, they no longer appear to be lovers, but they seem to trust each other with the same secrets. Matt serves as Hamyuts' number two within the Armed Librarians.