Passepartout does his best to be an exemplary manservant, ironing his master's Times every morning, keeping his evening wear immaculate. When the occasion arises he is also a fair cook, though with a taste for the exotic that Fogg deplores.
Passepartout's real genius, however, is for concocting things. He has created a workshop in the Aurora in which he can build almost any device Jules Verne can dream up, from a stun grenade to a magnetometer. He works at extraordinary speed; a device can be invented, prototyped and tested within the course of a single episode. It may not work as planned, but it will certainly do something.
See Also: Jules Verne