These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Uchuu Kyoudai
Awesome Music: The orchestral background music of the series as a whole can qualify as this.
Also the Feel so Moon opening by Unicorn and Eureka, sung by Sukima Switch.
Ear Worm: Feel so Moon as its best. It's the one that mostly people go and remember because of the phrase and the opening.
Ensemble Darkhorse: Apo. When you know that the story is about (mostly) the Nanba brothers, and Apo is sort of a mascot for the series as well, this cute pug is mostly the most favorite character of the series, having mostly merchandise dedicated to him.
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.