Costume:
Rebel Pathfinder, Rogue One.
Generic pathfinder based upon gear
multiple different pathfinders can be seen
wearing in the movie.

Things not clearly visible in the photos:
Sewn in transponder just under the
grenade vest.
Knees are sewn into a "kneepad" format.

Character:
Born and raised on the core world of
Ganthel, son of privilege and a military
family that served the Republic faithfully for
generations. Receiving high marks during
his early and secondary education, he
earned a scholarship to the Corulag
Imperial Academy. However, he would
desert the Imperial military just before
graduating, realizing he would be fighting
not for the ideals of the old Republic, but
the twisted whims of the new Regime.

While there was potential at becoming an
Alliance officer, it was decided he needed
more combat experience. Given his
specialization at Corulag in assault training
(he had been slated for the Shoretrooper
corps before he deserted) he was put into
the Pathfinders, where he quickly proved he
was rather adept at the hit and run, small
team tactics that the Rebellion requires.
Utterly devoted to the Alliance of Mon
Mothma, he seeks to restore the Republic in
a way that will ensure liberty and individual
freedoms will be restored to the Galaxy.