I had this idea before but I immediately got corrected as you can't tell what class/job the hero has xD can be slightly annoying in pvp (even more so if they have more copies of the same units). of course, this can be fixed by listing their respective classes under inspect but that's something more to do and more confusing for players.
Yeah I thought about it as well, placing the jobs below the icons or change the Slayer symbol to the current job.
But honestly guys, look at zerk Vincent, he looks old!