Auron is an ice and slash type damage dealer that boasts 3 different attack type resistances by 10% at base, and has a variety of attack moves with decent range that's good in high level contents. His arrival also comes with his signature weapon, the Shimmering Blade, further boosting his slash and ice attack by a significant amount. Potentially making him more f2p friendly since he's easier to build.
All of his counters only have a range of 1, but there are some minor variations between them. Counter (Auron) is arguably the best, since it's upgradeable through The Guide of the Story that also increases AGI. Flurry Counter is also upgradeable, and is a 2 hit counter attack, which can be good if it fits your mono ice team.
All of his main job skills are pretty good, and using it as a subjob gives Majestic Phoenix, a single skill that reduces both ATK and MAG, useful against bosses. His pugilist subjob gives strike attack skills, which won't benefit your weapon bonus, but comes with Shifting Strike to help get in range, then Spirit Breaker for ATK debuff. Soldier subjob is for more damaging abilities like Hazard Break and Hazard Spin that uses HP.
Upgrading him to EX upgrades his Infinite Possibilities to give DEF pentration, making him quite the tank buster if paired with his passive: One-Eyed Swordsman. The God-Killer upgrade and the new skill, Crouching Dragon, are nice additions, but not game changer enough if you're low on EX materials.