Source: cinemablend.com
5. Hourman III
(JLA, JSA, DC Comics)
Why did we all forget about Hourman III?
Created in the 853rd century, Hourman was an android who came to the present via some time travel shenanigans in DC One Million. He decided to stay in the present, and joined the Justice League of America under the name Matthew Tyler.
Throughout the late "˜90s and early 2000s, he worked with both the League and the newly reformed Justice Society of America. During this period of time, he had a chance to meet his genetic ancestor, Rick Tyler, or Hourman II.
You see, Matthew was built to include DNA from Rick's father and the original Hourman, Rex Tyler, who had died some years before. When Rick tried to travel through time and save Rex from death in the Zero Hour event, it nearly broke the timestream. Someone who was Rex Tyler’s genetic match had to die. So Matthew stepped in and gave his android life for his progenitor, and saved the original Hourman from his fate.

