A normal girl from the countryside at first, Cath's village was burned down by her father under orders from nobles, causing her to hate nobles with a deep passion and steal from them as a result. During her multiple encounters with Roy, Cath regarded him as a snobby noble at first and did not believe his sympathies when she told him her tale. Eventually, she grew interested in how he lacked a noble demeanor, and became his ally after she confirmed that he was truly unlike the rest of them when she heard that he would help her rebuild her village.

After the war ended, Cath declined invitations from various places to continue traveling alone. She kept an eye on whether or not Roy would be able to keep the promise he made to her when he invited her to be an ally. Priding herself for being a chivalrous thief by stealing only from nobles, Cath is abrasive and frequently tries to steal from her own allies, but takes a genuine liking to her support partners and usually ends up giving back whatever she stole from them.

Because of the harsh mistreatment she's endured in the past, Cath has an extreme hatred for nobles and influential people, and even despises her father for being the one to put the torch to the village, though Bartre points out that he likely did it to protect her and the other villagers, considering how their lord's soldiers were starting to draw their weapons.