Tondekeman is a sentient stainless-steel kettle-shaped time machine featuring a built-in computer for human-like speech and data decryption. It adorns sunglasses and speaks in the lively Kansai dialect, displaying a witty personality that humorously acknowledges whoever holds it as its temporary "master," following their orders unless ownership shifts. Time travel activates by projecting a radiant beam from its spout to create a "dimensional hole," which remains accessible for ten minutes before sealing shut. Destination inputs are primarily voice-commanded, though its original design relied on adjusting dials integrated into its ear-like handles.

Programmed to adaptively interpret unclear or fragmented user instructions, Tondekeman demonstrates resilience when damaged during a critical event, later restored by inventor Dr. Edison. Its creation traces to Dr. Leonardo, ultimately revealed as Renaissance polymath Leonardo da Vinci, who engineered it as a temporal exploration tool.

During its operations, Tondekeman sparks historical conflicts after being commandeered by sorcerer Abdullah, who manipulates its functions to abduct Princess Shalala across timelines. While its allegiance shifts with possession, the device maintains a steady, pragmatic demeanor regardless of its current operator.