Outlander
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There already is Maniac Mansion Deluxe.
Maniac Mansion was such a good game! I was totally blown away by it. Sure, fancier stuff was released afterward such as MI, Beneath a Steel Sky, Gabriel Knight, Last Crusade, etc... But none of those offered multiple character selection that in turn affected the way you could progress in the game, with multiple solutions to puzzles and even dead-ends. Very RPG-like adventure. The only other classic adventure that did something similar was Fate of Atlantis but it was limited to a 'choose 1 path out of 3' early in the game.
Of course Sierra had King Quest series but sadly I wasn't exposed to those at the time.