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.
42. Bad Borrower
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Dot's horrified to hear her friends consider her a "bad borrower", but when she loses Hal's digital camera she wonders if perhaps they're right.