According to the author of the book of Samuel, Eleazar was a brave warrior who stood with David to fight against the enemy, even when all of their friends ran away. He was one of David's best and strongest soldiers.
2 Samuel 23:9: And after him [was] Eleazar the son of Dodo the Ahohite, [one] of the three mighty men with David, when they defied the Philistines [that] were there gathered together to battle, and the men of Israel were gone away:
This verse lists Dodo as the father of Eleazar whereas 2 Samuel 23:9 lists Dodai as Eleazar’s father.
1 Chronicles 11:12: And after him [was] Eleazar the son of Dodo, the Ahohite, who [was one] of the three mighties.