Appearance
He was short and stocky with graying hair.
History
Tomas was a Darkfriend before meeting Verin. He wanted to turn back to the Light but found that the Dark One wouldn't let him go. Ten years after the death of her first Warder, Verin bonded Tomas and offered him the chance to fight the Dark One by helping her study the Black Ajah from the inside which he agreed to.
Activities
He was part of the Amyrlin's escort to Fal Dara. For some reason, he didn't accompany Verin when she joined Rand al'Thor and the others when they were searching for the Horn of Valere and ended up battling the Seanchan in Falme. Tomas was frantic with worry for Verin's departure. Presumably, he returned to Tar Valon with the rest of the party.
He was then with Verin when she was in the Two Rivers when Perrin Aybara came back to confront the Children of the Light. He helped the village in fighting the Shadowspawn army.
Tomas stayed for a time with Alanna, Verin, Ihvon, and the Two Rivers girls in Culain's Hound in Caemlyn.
Tomas fought along Verin in the Dumai's Wells battle.
He then Traveled with Verin and Cadsuane Melaidhrin's party to Far Madding to track down Rand. After leaving Far Madding, he stood guard over Min Farshaw and Harine din Togara Two Winds during the Battle near Shadar Logoth.
Tomas accompanied Rand and Verin to Algarin Pendaloan's house in Tear where Rand recovered after cleansing Saidin. He watched Lan Mandragoran and Jahar Narishma practice sword play in the courtyard with the other Warders.
He left with Verin when she departed from Rand and his company.
Tomas was with Verin when she met with Mat.
When Verin visited Egwene in the White Tower and confirmed that she and Tomas were Darkfriends, she stated that Tomas was spending his last hour of life with his family before dying of the poison he gave himself.
In the television series
In the television series, Tomas↗ is played by actor Heikko Deutschmann↗.