Dot.
8-year-old Dot is a ball of energy who launches herself into adventures and fearlessly sets about solving problems (which she most likely created herself) in the same way any 8-year-old would... by messing up a lot and laughing even more.
48. The Shooting Star
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Dot and Ruby find themselves at odds when Dot is excited for Ruby to come to an astroclub meeting, but Ruby would rather be at a concert instead.