Asil was one of Tuvok and T'Pel's four children. She was their youngest child, and only daughter. She was conceived during Tuvok's eleventh pon farr, and was born in the city of T'Paal on Vulcan. (VOY: "Elogium", "Alice", "Unimatrix Zero, Part II")
Kathryn Janeway, a long time friend of her father, was present at her kolinahr. (VOY: "Fury")
In an earlier draft of VOY: "Repression", Asil was a detective for the Vulcan police.
The Star Trek: Voyager Companion (unofficially) says that Asil may be the Borg Queen's name.