- For other characters with the same first name, see Kenny.
- "Kenny was one of the first people I lost on Earth. Doesn't get any easier."
"Keeper of secrets."
- —Kara Danvers and Alex Danvers[src]
Kenny Li attended Midvale High School, where he was considered an outcast by his peers, often ignored at best and ridiculed at worst. Kenny was bullied by the school star quarterback Jake Howell in particular, after catching the latter smoking pot on campus.
Kenny was fascinated with astronomy and would frequently sneak out to go to the woods stargazing at the sky through his telescope. He would store the images he digitally captured on his laptop.
Kenny was Kara Danvers' only friend in high school, as she was also considered an outcast. He also befriended Kara's adoptive sister, Alex Danvers, whom Kenny was secretly tutoring in calculus. However, out of embarrassment, Alex didn't acknowledge him in front of her other friends (which she would regret). Kenny soon formed a crush on Kara and the two almost shared a kiss while stargazing in the woods.
Kenny also observed other people in the woods through his telescope. At some point, he caught Samuel Bernard, a history teacher at his school, having an affair with his classmate Josie. Concerned, he tried to talk to Josie but she brushed him off and warned him to stay out of it. Despite this, Kenny sent a copy of the telescope image to Mr. Bernard as a warning and was presumably going to report this.
Shortly after, Kenny caught Sheriff Ronald Collins participating in a drug deal on his telescope. Collins subsequently shot and killed Kenny and stole his telescope in an attempt to get rid of the evidence against him. However, Kenny was able to hide his laptop before being murdered.
Kara and Alex worked together for the first time to investigate Kenny's death. Kara initially interrogated Jake, who confessed that Kenny caught him smoking pot and was subsequently suspended. Kara and Alex later discovered Kenny's laptop buried in the woods and uncovered the picture he took of Mr. Bernard and Josie. Alex reported this to the authorities, causing Mr. Bernard to be sent to prison. After Kenny's files were decrypted by Clark Kent's friend Chloe, Sheriff Collins' drug dealing was discovered. Collins tried to kill Alex as well to cover this up, but Kara saved her. Collins was then arrested, getting justice for Kenny's murder.
While Kenny's death was a tragedy, it ultimately brought Kara and Alex closer together. Kara also discovered from Chloe that Kenny had a picture of her flying on his laptop; he knew Kara was an alien all along, but kept it a secret and liked her anyway, much to her surprise and joy. Kara remembers Kenny as the first person she lost on Earth and a keeper of her secrets. Kenny's telescope was recovered and given to the Danvers sisters by his mother as a thank-you gift for solving the murder, and has remained a keepsake in the Danvers house.
Collins was released from prison 11 years later, but remained haunted by his murder of Kenny.
- Kenny had asthma.