Leck was a Ferengi entrepreneur and a professional Eliminator. Unlike most Ferengi, however – he was more interested in honing his combat skills than in earning profit. Perhaps his best skill was knife-throwing.
Leck gave potential clients specific instructions to contact him only via a secure channel.
In 2374, Leck was recruited by Quark to join a team of Ferengi commandos that were trying to rescue Quark's mother Ishka from the Dominion. Leck eagerly joined for the opportunity to test his skills against the Jem'Hadar. However, although he claimed he had no interest in gold-pressed latinum, he also hated being cheated – as Quark tried to do by telling the team that there was only a twenty-bar reward, when in fact Zek had promised 50 bars.
Upon the successful conclusion of the mission, Leck commented to Quark, "This is the sloppiest, most amateurish operation I've ever seen... If you ever do something like this again, count me in." (DS9: "The Magnificent Ferengi")
"You see, Nagus, my father was a very astute businessman, but he had an unfortunate weakness - oyster toads. Very tasty, but sometimes toxic."
"I hope this is a secure channel?"
"I followed your instructions to the letter."
"Very good. Who do you want eliminated?"
"I don't care about latinum"
"How do we know these schematics are accurate?"
"No need to stand on formalities here - call me Leck."
"No, I meant you should call me 'sir.'"
"Don't be ridiculous."
"You mean 'don't be ridiculous, sir'"
"This is the eighth run-through and you haven't even hit a single Jem'Hadar. And you shot Moogie."
"I could see that we weren't going to rescue her - so I put her out of her misery"
"I've never seen a sloppiest, more amateurish operation in my life... If you ever do something like this again -- count me in!"
Leck appears in the Worlds of Star Trek: Deep Space Nine short story Fereginar: Satisfaction is Not Guaranteed, in which, in the year 2369, he undertakes a mission that leads him to Terok Nor. It is there where he meets Quark, who happens to have a Deltan holosuite program that Leck has been after for years. Leck also successfully assassinates a Romulan Tal'Shiar operative and several Nausicaan guards. Furthermore, in late-2376, Leck is hired to break into the Glat Archive and find evidence that a marriage contract between Grand Negus Rom and Prinadora had not been dissolved. Leck found the mission extremely difficult, but also a great challenge. He managed to infiltrate the facility posing as a Torf and download the contract.