Kenny, called Kouji in Japanese, serves as Penny's older brother. Their relationship features mutual animosity for unknown reasons, though Babyfier temporarily transforming Kenny into a toddler revealed Penny's underlying sadness and concern for him despite their usual hostility. He frequently acts alongside friends Marvin and Ted as part of Penny's group, often termed her "minions." Kenny maintains a fierce rivalry with Yuna and Stitch, though he occasionally cooperates with them, such as when Stitch used his cousin Hunkahunka's abilities to help Kenny win Sasha's affection. Significant events trigger character development, like Kenny visibly expressing tearful relief and happiness upon witnessing Stitch survive the black hole explosion ending season two. Romantically interested in both Sasha and Yuna's cousin Tigerlily, Kenny's affections are revealed when Tigerlily reads aloud from Stitch's diary, exposing his continued feelings for Sasha alongside his attraction to Tigerlily's "mature beauty." In printed media like the "Stitch! Best Friends Forever!" manga, Kenny engages in bullying. In "Do Your Best to Do Good," he, Penny, Marvin, and Ted deceive Stitch into taking an old man's pineapples and convincing Stitch that Taro's glasses are cursed under false pretenses of good deeds. Later, when Kenny accidentally throws a ball into a Kijimunaa-inhabited forest, the group flees after asking Stitch to retrieve it. "Karate Match" depicts Kenny challenging Stitch and Yuna to a karate match to bully them, though he retreats upon becoming intimidated by Stitch's strength. A trivia note connects Kenny to the original *Lilo & Stitch* series, where Lilo temporarily called Stitch "Kenny" during one disguise.