Chakotay
Chakotay was a member of the Maquis who's ship got sucked into the Delta Quadrant by the Caretaker array along with Voyager. His ship was destroyed there and so he and his crew decide to join with Voyager for the ride back to Earth. Janeway makes Chakotay her first officer and grants him the "provisional" rank of lieutenant commander.
He was the one who recommended Torres be made chief engineer. This doesn't speak well for his true loyalty to Voyager. More likely, it suggests he wants to get the ship destroyed before they get back home. He frequently objected to Janeway's decisions but he would turn around and tell his former Maquis crew to obey her orders anyway since she's the captain.
Love life
Chakotay and Janeway's relationship seems to sway back and forth from teetering on romance to counter point. I guess her genocidal rampages were just too much for him. However, by the end of the series, Chakotay hooks up with Seven of Nine for no particular reason.
Walking Stereotype
Chakotay embodies just about every Hollywood stereotype concerning American Indians there is. He is supposed to be Mayan and yet he pursues vision quests and believes in animal spirit guides[1]. People use a medicine wheel and coyote stones [2] to try and heal him. He insists on not even scanning a burial site to avoid violating its "sanctity"[3]. Hawks are sacred symbols of their people and messengers of the spirits, etc. Just as Neelix takes every opportunity to tell stupid personal anecdotes, Chakotay does the same with telling the "sacred legends of his people". And to make it all even worse, this was apparently all programmed into American Indian genetics by alien visitations thousands of years ago[4].
If Voyager had gone on longer, its entirely possible the writers would have had him open a casino next to Neelix's galley.