Fine, you can needlessly troll and dispute it all you want but it is obvious to anyone that isn't blinded by ninja fanaticism that the simularities between the outfits are worlds more in common with the assassin than your presented ninja.



Complete with similar color pallet, and similarly shaped caplet. Not really a point but both characters even have over-sized ears!
Now it is my understanding that class appearances, names, and abilities do sometimes get switched, mixed, and matched between similar jobs/abilities; for example, the Red Mage and Rune Fencer frequently do this between different games. So this could be a ninja, just looking like and maybe even named assassin to better fit the European market/esthetic.