What is "timewalker"

Ivar the Timewalker is a character in the Valiant Comics universe. Created by artist and writer Barry Windsor-Smith, he first appeared in Archer and Armstrong #8 (March 1993) which was a flip book with Eternal Warrior #8.

The original series was 15 issues, was a central character in "Valiant: 1999 And Beyond" and was subsequently revamped for the VH2 Universe in 1998.