Talronn was born into a Mandalorian family in the Old Republic. He grew up to become a highly capable warrior. As he grew older however, he became disillusioned with the Mandalorians unwillingness to be drawn back into the wars of the Sith, who he viewed as being the ultimate force in the galaxy. So he packed his gear, flew to the Sith homeworld of Korriban, and joined the Sith Empire military, stipulating that he must still be allowed to wear his distinctive white armor, and only be used on missions requiring more skill than normal. So he joined the Imperial Commandos of the Sith Empire. The Sith Empire, seeing his value and skill, sent him on a top secret mission to destroy a secret Republic dreadnought. But once him and the commandos he was with landed, they realized they were on an old research station. From a holorecording, they found out that the station is from several thousand years ago, and that they had been researching how to make Force sensitive war beasts, and that one experiment got away and was running rampant in the station. They realized they had been sent to kill it, and so Talronn and the others went and killed the beast, as well as several old Sith, as the station kept warping between time periods. After killing the beast, the station started to fall apart. So they took the shuttle of the old commander, and flew away. They jumped to hyperspeed, but time warped again as they did. They ended up in the modern Empire. Now they are on an Imperial ISD, which is apparently commanded by the old commander of the station, who also managed to escape somehow.

If you combine Reaper (from overwatch), the Mandalorian, and the Master Assassin Ezio Auditore: you would get this character.