Kakuzu is probably the most greedy character in Naruto. He is obsessed with money, in fact that is his primary concern as an Akatsuki member. He basically kills solely for financial gain.
Fullmetal Alchemist's Greed is easily the best candidate I can think of to be one of Larfleeze's Constructs. He is greedy about everything, power, women, money, it's all good to him. Interestingly he isn't just greedy about things often seen in a bad light i.e excesses. He takes it a level further and evolves greed into a kind of protectiveness for those he loves.
Griffith is the main villain from the manga Berserk. He sacrificed his entire army just to gain the power of demon gods.
Apocaplypse was greedy in the standard villain wanting to take over the world way. It wasn't as personal as with Griffith which was rather horrific. Apocalypse stole powers of others to try and get world domination. He would be a good Orange Lantern Construct though.
Let's now see what Norman Osborn approves of today.
Thanks Geoordie Green Lantern. Today I approve of: greed.