Well I'd say my 'laziest' way of making them less like plagiarism is to give them some kind of quirk, a la Shyamalan, but another thing I do is to tweak them until they're unrecognizable from their original through some method or another.
My main form of creativity has always been to take something unoriginal or something I just like, and blend it with other stuff I find cool until it eventually becomes unique. My main man Kuroshika is a Japanese man with the 'stoic giant' base who has developed into a unique character by way of prosthetic limbs, heterochromatic eyes, use of exotic weaponry (which is kinda silly given with his size he could focus on strength and probably win most fights through sheer curshing force) intellect, strategy, and a few other things - though he's my most worrying character, I often feel like he's too generic and simple so in almost every iteration of him I make him very different. He's been treeman, roboman, richman, poorman, swordsman, family man, but I still haven't found something I'm completely happy with.