His head is that of a black panther's, but has a white muzzle and a scar running down across his left eye. Like his fellow commanders (except Hughes), he wore a personal set of battle armor with a long cape draped around his body, as well as a helmet vaguely similar to that of Lyon Vastia.
However, when he reached Earth Land, he took a form which is more typical for Exceeds, as a small, bipedal black cat with round ears. His facial features are retained, albeit in a very deformed manner. Although he can return to his former form, he can only do so for a very limited amount of time. His guild tattoo is on his back in the same place as Happy and Carla's, and is gray in color.
Pantherlily seems to have a grumpy disposition and detests noisy people. He first appears by demanding that Byro and the hyperactive Hughes quiet down (although Sugarboy noted that Pantherlily was in a nastier mood than usual). He also seemed to have reservations about Operation ETD, unlike the other commanders. This was presumably because he did not want his own race to be destroyed, despite the fact that he had also said that Extalia was a fake country, one he discarded a long time ago. However, Lily is on good terms with Mystogan as he saved the young prince from death when he was a small child. Pantherlily does not discriminate against Exceeds or humans and treats them as equals, unlike the Exceeds in Edolas who viewed themselves as superior to the humans.
According to his Guild Card, Pantherlily likes kiwi (the latter of which can be seen when he, Happy and Carla are having a snack break) and hates thunder (the latter of which can be seen in his time on Tenrou Island). He also seems to have a penchant for oversized weapons, as shown from his handling of the Bustermarm Sword and his liking for the Musica Sword.