Ishi is wild by nature, but has had its behavior modified to accept the presence of humanoids by an intervention. It is trained against its wild instincts to accept humanoids. As creature handling goes up, a member can better empathize, train, and manage this creature's behavior. Untrained (+0), this creature will do whatever it wants and one would be helpless to understand why, with its natural disposition taking over. As creature handling skills improve, a member can understand, care for, and better influence this creature with full control achieved with mastery (+5) of creature handling.

Ishi is inherently reserved when compared to the rest of their kind. They tend to react to extreme conditions like loud noises, bright lights, aggressive action, or perceivable threats by retreating or looking for a place to hide. This timid nature can be mistaken for weakness, but underneath remains a strong, caring spirit that still very much wants to be a part of the world around them.

Ishi is smaller than the average Loth-cat in terms of size or body mass. Their compact build can offer better mobility and agility but often at the expense of the power commonly associated with other Loth-cat.