Dalek Time Commander

The Time Commander was a unique Dalek loyal to the Emperor, who headed the Time Squad, a battalion of Time-Sensitive Daleks deployed by the Emperor to attempt to make history more favourable to the Daleks after a divergence in the timeline was detected, (PROSE: The Guide to the Dark Times) which rewrote the Daleks to have been fighting a losing war against the Hond instead of having fought in the Last Great Time War. (COMIC: Defender of the Daleks)

Physical appearance
The Time Commander was a unique Dalek variant: it drove a casing which had the broad design of a Bronze Dalek but was painted a metallic grey. Its sense globes were the same gray colour, with a ring of blue at their base. Its indicator lights and the lens of its tele-eye were both white. (PROSE: The Guide to the Dark Times)

Psychological profile
Melody Malone described the Time Commander as "ruthless even by Dalek standards". It was "determined" to seize any opportunity awarded to the Daleks by the fluctuations in Time, willing to go to worrisome lengths to achieve its people's goal of supremacy. It was, however, "fiercely loyal" to the Emperor Dalek. (PROSE: The Guide to the Dark Times)