Robota

A former Servant Robot, Series III, put out to pasture by the new model, Robota got a second chance at life thanks to Planet Terry. Naturally inquisitive and obliging, Robota goes out of her way to help people – even those who have previously threatened her wellbeing – and does it all with a pleasant demeanour and a well-natured wisecrack. She's protective of Terry, as can be seen when a certain beautiful princess enters the picture... or is that a bit of jealousy in her optic sensors? She'll never admit to it.

Robota is a valuable ally, with her mechanical nature giving her a great physical strength. Her steel skin means she is resistant to damage and, uh, tickling (which does come up), but does leave her vulnerable to magnetism and oxidisation. Anything she can't bonk on the head, she can blast with her head-mounted robot ray beam.