Golden Age Mr. Terrific (Terry Sloane) - 1st appeared Sensation Comics #1 (1942)
Michael Holt - 1st appearance in Spectre #54 (June 1997) / was also in the New52
Kingdom Come / Earth-22 version of Mr. Terrific - 1st appearance in Kingdom Come #1
Liberty Files version of Terry Sloane - 1st appearance in JSA: The Liberty Files #2 (March 2000)
Other (please explain in a separate post)