Marth has a neutral B that can (sort of) be used as a horizontal recovery option (and it's kind of like Minus in that he lunges forward - no cancel though). Link's Whirling Leap up+b has recovery ability similar to Minus (no hitbox). Falcon has a raptor boost with armor - not quite projectile immunity but hey it's close. Ike doesn't become helpless if his side+b hits someone (close to Minus, not quite but whatever). Kirby's hammer can be charged. Link has strong arrows, kind of like full-charged ones in Minus. He also has a multi-hitting boomerang on the way back (not as good as Minus but that's to be expected). Falco and Fox don't become helpless out of Phantasm. Falco has a longer-range Firebird (not Minus length but still very long). Samus has a screw attack variant that was a lot like her old Minus fair (which was a bad fair, but the new screw attack is fine).
There are probably other examples, especially since I haven't unlocked most custom moves. However, I don't think they took from Minus as much as cooked up ideas that were similar to our own because many of the steps Minus takes are fairly logical, even if the end product looks somewhat crazy to those not used to Minus.