- Awesome Music:
- The orchestral background music of the series as a whole can qualify as this.
- Also, "Feel so Moon" by Unicorn and "Eureka", sung by Sukima Switch. It's the one that mostly people go and remember because of the phrase and the opening.
- Ensemble Dark Horse: Apo. Even if you know that the story is about (mostly) the Nanba brothers, and that Apo is sort of a mascot for the series as well, this cute pug is the most favorite character of the series, having more merchandise dedicated to him than the main characters.
- Incest Yay Shipping: Mutta/Hibito is one of the most popular (if not the most popular) ships in the fandom.
- Launcher of a Thousand Ships: Mutta,as you can see here.
- Narm: It's a minor moment, but Kenji's "You can always start over" line (said to his daughter after she accidentally knocks over a block tower she had been constructing during a tantrum after learning that her father wasn't going to the Moon like he had told her he was) takes on a hilarious and probably completely unintended meaning when the camera immediately cuts to a shot with his obviously several-months-pregnant wife watching from the sidelines.
- Iron Woobie: After his near-death experience on the Moon, Hibito develops a severe case of PTSD which triggers panic attacks whenever he tries to put on a spacesuit. He gets better, but that's not enough for NASA, so does he gives up going to space? NOPE, he goes to Russia to become a cosmonaut. He really is the strongest astronaut/cosmonaut.
- Wheelchair Woobie: Poor Aunt Sharon.
YMMV / Space Brothers