Pitru was a male cat of Green Isle, the son of Riggu Felis and Lady Kaltag, and the younger brother of Jeefra. Though the younger of the two brothers, he was the fiercest and most cunning, secretly plotting to be ruler of Green Isle. Pitru often bullied his brother, and taunted him about how he was going to rule the fortress.
After deciding they were both spoiled, Riggu enlisted his sons under Weilmark Scaut as common soldiers. They ended up in a small boat which was capsized by rebelling otter slaves.
Pitru was the first to surface. A drowning and panicked Jeefra begged him for help, but Pitru refused, and smashed a wooden paddle over his brother's head and paws, knocking him out and killing him. Many cats, including their mother, believed the otters had slain Jeefra. However, his father suspected the truth, and had his aide Atunra watch Pitru.
When Riggu left his fortress, Pitru, the newly-appointed Fortress Commander, made an impression on some of the catguards, in particular Yund, Balur, and Hinso. He ordered Yund to kill Atunra, and Yund complied. However, when her body was found, Riggu brutally executed Yund. Balur warned Pitru that he was probably next, and Pitru and his followers fled.
Pitru and those loyal to him and set up an encampment on the side of the Deeplough. After defeating Riggu, the Otter Clans of Green Isle launched an attack on Pitru's barricade, which was well defended on all fronts. However, Pitru's outnumbered force was quickly overwhelmed, and in the midst of battle he encountered Cuthbert Blanedale Frunk, who was on a berserk killing spree.
Since the rampaging hare was unable to use his pike-axe's blade at short distance, he pulled Pitru close and broke his back with the axehaft. Pitru's dead body was eaten by the Slothunog after Frunk threw himself, still holding the cat with the axehaft, into Deeplough.