Ink kinda has that effect on people that just makes you want to never give up. That was litteraly the idea behind him and so many people never gave up because of him.
He's special. Even in our world. Even the most random sketch feels like a big deal thanks to him. He just inspire the world to try their best and express themselves. He's not perfect but he is himself and thats all that matters to him. He chose his future and job. He is an exemple to follow. (just don't throw paint at people guys).
I think that's what makes him unique and authantic.
(Note : He is everything that Sans isn't. We should call him Ink!Sans'nt at this point.)