When Pitt went into Shimmerspace, a backlash bathed Shiro in tachyons . This gave him the memories of the things he was going to do and see, effectively making him able to see the future or rather remember the future . Other than that, nothing was revealed about John Shiro.
His choice of weapons indicates a proficiency with katanas.
Full Bleed/Dale Keown's part of the Image universe
Pitt (vol. 1) #5 (1994)
Country of origin:
1: Pitt (vol. 1) #14
2: Pitt (vol. 1) #16