Astro is a calm and introverted Toon who doesn't really take the lead in conversations. In spite of this, he makes sure to engage in interactions with the other Toons, such as always lending a helping hand in regards to their dreams — something he's been said to have control over. He enjoys peace and quiet, and is a bit high-strung in relation to anything interfering with those two things. Even so, Astro does genuinely care for the Toons around him, although he can unintentionally come off as standoffish sometimes. A lot of Astro's character also seems to revolve around outer space and sleep, given his appearance, name, the floor based on him, and his interactions with the others.