Armin Arlert's father never appears alive in the main story. An inventor at heart, he builds a hot air balloon to carry his family past the Walls, a dream of escape that ends when Military Police officer Djel Sannes executes him and his wife for the attempt.
The serialized manga never gives a clear look at Mr. Arlert; the Attack on Titan Character Encyclopedia later unveiled his visual design.
Everything known about him points to daring and brains in equal measure. Engineering a balloon capable of lifting two people over the Walls marks him as remarkably intelligent, and staking his life on flying it marks him as courageous.

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Together with his wife, Mr. Arlert attempts to escape beyond the Walls by air, and both are killed for it by Djel Sannes of the Military Police Brigade. Their son Armin grows up believing something else entirely; early in the story he claims Titans killed his parents in the failed campaign to retake Wall Maria, even though the balloon flight predates the breach of the Walls, a contradiction the series never resolves. He is the son of the elderly man who raises Armin, known only as Grandfather Arlert.
Armin Arlert's father is known simply as Mr. Arlert, an inventor who builds a hot air balloon to try to carry his family beyond the Walls. He never appears alive in the main story and is executed alongside his wife for the escape attempt.
Mr. Arlert and his wife are executed by Military Police officer Djel Sannes as punishment for attempting to fly a hot air balloon over the Walls to escape.
Armin Arlert grows up believing Titans killed his parents during the failed campaign to retake Wall Maria, even though his father's balloon escape attempt actually took place before the Walls were ever breached, a contradiction the series never resolves.
Mr. Arlert is shown to be intelligent and courageous, engineering a hot air balloon capable of lifting two people over the Walls and risking his life to fly it.
After Mr. Arlert's execution, his own father, known only as Grandfather Arlert, raises young Armin.
Looking for more on Mr. Arlert? The Attack on Titan Wiki on Fandom has a dedicated page with community notes.
View on FandomThis content is original writing by Daddy Jim Headquarters based on the Attack on Titan anime series, manga, and official materials. Attack on Titan was created by Hajime Isayama, published by Kodansha, and animated by MAPPA and Wit Studio. All rights to Attack on Titan and its characters belong to their respective owners. Episode and chapter references are cited where applicable.
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