Colonel Hardy, Superman, Steve Trevor, and General Antiope. 💪 These characters showed what true heroism means when they gave their lives to save many more. "A good death is its own reward." *Yes obviously Superman isn't dead for good, but that takes nothing away from his noble sacrifice. He had no idea he would come back from it.
**Also I totally forgot about El Diablo, as the comments will show, oops. My bad, guys, his sacrifice was awesome too.