Considered level-headed and unflappably calm, Koon was among the wisest members of the Jedi Order. He was deeply concerned with every form of life. Koon also had shared a special bond with Ahsoka Tano , whom he brought to the Jedi Order as a toddler.
When Tano was framed for murder and treason, Koon found it difficult to believe that the girl he'd brought into the Jedi Order could have fallen into darkness, but the evidence against Tano seemed overwhelming and he joined the Council in expelling her from the Order. After her innocence was proven and the real traitor apprehended, Koon joined his colleagues in apologizing to Tano and inviting her to rejoin the Order. He was deeply saddened when Tano instead chose to walk away from the only life she'd ever known.
Plo Koon was one of the best pilots in the Jedi Order and his skills were often praised by fellow Jedi such as Anakin Skywalker when he and Obi-Wan Kenobi crashed on Carnelion I and Mace Windu when he assembled his team for one of his first missions in the Clone Wars and compared the pilot skills of Rissa Mano with Plo Koon.