Hadron used to be the food vendor and be positioned at the end of the bar closest to the door. With the release of Victory is Life, Hadron's role and place was filled by Quark (along with the missions Hadron was involved in). Hadron's role and spot was previously occupied by Woadroh "Woadie" Bhoith.
“Of Bajor”: The player uses a subspace relay to covertly contact Hadron after Deep Space 9 is seized by the Dominion. He provides the player with information on Kar'ukan and Loriss, and reveals that they believe the Dominion War is still going on, and they had expected a Dominion fleet and a Founder to be awaiting their arrival.