The perfect people for a one-way trip to Mars? Wanna-be astronauts who didn't make the cut. They are intelligent, driven, motivated, enthusiastic, etc. etc. This is their chance to "make it right" to achieve their dream and make a solid contribution to the space program.
And by "make a solid contribution to the space program" you mean go away to live the rest of your deprived life in a small, isolated shelter on a lifeless, desolate world. Picture the most fantastic room you could possibly imagine. It could even be pretty big: say, as big as a movie theater auditorium. It's got all the diversions and entertainments that can fit. Sex, drugs, rock n roll, video games, books, movies, music, etc.; all are here for you. New stuff will be delivered all the time. As much as you want. There are even doctors to keep you healthy and robots to keep the place clean. You will be as comfortable as you can possibly be. But here's the catch: you will NEVER leave. If you would take even a moment's pause before entering this room, consider that none of that would be available on Mars. A shelter on Mars will have very little in the way of comfort. It won't be very big, and there won't be any new stuff (at least, not for months on end). Of course, you'll have to work there if you want to stay alive. The few other people there will be concerned with their own survival, too. The only thing this has in common with the dream room above is that once you enter, you can never leave.
What about the GRAVITY on Mars? 38% of Earth's! The same as Mercury's surface gravity. Doctors & physicists need to weigh in here on the long term effects on humans from living the rest of their lives in a gravity field 62% weaker than Earth's!
Looks like Martian colonists won't have to worry about Alzheimers. https://m.curiosity.com/video/scien...tracting-gravity-from-alzheimers-h6o6hsugzvw/
This summer SpaceX will launch their new Falcon 9 v1.2, which has about 30 percent more payload capability than the v1.1