Bonny Lass is a large harbour tug and second in the Rodos Moon Fleet. Bonny Lass could be considered the most angtagonistic and solitary of the Moon Fleet due to her cold ruthless manner and brief mono-syllabic speech. Bonny Lass has a rather frightening reputation to be aggressive and easily provoked; this is shown in her strong rivalry with Big Mac from the Star Tugs. However she is one of the most complex characters in the series; Bonny Lass has a great deal of protectiveness for her closest friend Princess, a fellow Moon harbour tug. She is often seen frightening away the T-Piles, who are tormenting Princess, this strangely gives her a large amount of respect from other members of the harbour.