Agate

Agate is a member of TOWIR who first appears on a boat somewhere off the coast of Spain in Black, White and Shades of Mediochre. She appears to be the direct superior of Obsidian (aka Catriona Haulier).

Traits
Agate comes across as very self-assured and glamorous. In her first appearance she is sunbathing topless on a boat somewhere off the coast of Spain. The fact that the designer sunglasses she also wears would give her an odd tan-line is not addressed. Her accent is described as 'generically European'.

The Good, the Bad and the Mediochre
Agate does not explicitly appear in The Good, the Bad and the Mediochre, but what is probably her voice (since the accent is definitely European but otherwise unplaceable) appears in the TOWIR scene of the opening sequence.

Black, White and Shades of Mediochre
Agate makes her first real appearance sunbathing topless on a boat somewhere off the coast of Spain, where she and Obsidian (aka Catriona Haulier) discuss the fates of the TOWIR members who appeared in the previous book. She then appears at the end of the book to debrief Jasper and the tempomancer. Again she is sunbathing, but this time she's in her private villa.

Caught Mediochre-Handed
Agate appears at the end of Caught Mediochre-Handed, getting a massage from a deaf masseur. She eats chocolate-coated strawberries, which she keeps in a hidden drawer of her marble massage table, while debriefing the tempomancer again. She tells him that they are about to enter the final segment of the Tertiary Phase of TOWIR's plan. As the tempomancer leaves, she warns him not to fail and anticipates the next stage of the plan, which is due to happen around Christmas time.