Earl Boen's LeChuck was always one of my favorites performances in the series. Possibly my favorite, period. In fact, finding out that he was not to be involved in Return put a non-insignificant damper on my expectations.
One of those rare, lightning-in-a-bottle casting choices that almost makes it impossible to think that the character wasn't written for him in the first place. He switched effortlessly between LeChuck's goofy, foolish side and his creepy, sadistic side. His take was so perfect and so unique that he's basically irreplaceable. Because even if you hire very talented actors (as they did), inevitably you end up either with someone who kind of sounds like he's imitating the previous performance (Adam Harrington in Tales), or someone who sounds like an entirely different character (Jess Harnell in Return).
I would love to hear some day the specific behind-the-scenes circumstances that led to his returning for the first Special Edition but initially not for Tales, despite both games being developed simultaneously. And then his return for the last stretch of Tales. I can only assume, perhaps mistakenly, that had he been involved with Tales since the beginning, he might as well had voiced human LeChuck too, so that would have been a very significant role.
He will be sorely missed.