- See also: Fanfiction involving Kevlly
Kevin and Shelley are believed to be around the same age based on their similar character models, and are siblings of the main characters. Though Shelley appears often, other characters her age are very rarely seen.
Their only interactions in the series is that they can briefly be seen sitting together at Cirque De Cheville in the episode "Quintuplets 2000" and at a school assembly in "Fat Butt and Pancake Head".
This pairing has a long history, with examples as far back as 1999 though often in more minor instances back then. As they are the only characters their age, most fanfictions they are in focus on either Kevin or Shelley being in a relationship with a pre-introduced character, but they end up together anyway, though this has diversified in recent years.
- See also: Fanfiction involving Kevelly
|SP2K: The Millennium in South Park||
Rachel C|| style="text-align:center;"|PG||1999
|The citizens of South Park celebrate the arrival of the millennium.|
|Crashed The Wedding||Madcow5678||T||Sept 16, 2008|
|After Shelley Marsh leaves Kevin heartbroken, he knows he has to do something. Unfortunately, that something involves crashing the love of his life's wedding.|
|Accident||SpellboundWinter||Explicit||May 1, 2014|
|I worked at threadin' sheet metal in one section 'nd in another she was cleanin' the hot metal with a hose. When my arm got halfway ate into the machine, she was right there. The way she scowled took all that pain from the accident away. And when my kin up 'nd abandoned me, at least she stayed by my side. Who could ask fer a better girl?|
|Never Forget Your Skates, Kids||spookybearbearhelldream||M||August 7, 2015|
|Shelly Marsh and Kevin McCormick have known each other for a long time, but it wasn't until they both found their tickets out of South Park, CO that they really connected.|
|Wherever She Goes, Destruction Follows||pepsicola||M||February 16, 2019|
|Shelly's and Kevin's brothers are friends. And just because their dumb little brothers are friends, that doesn't mean they're obligated to be friends too. They barely even know each other, and they're so different. Shelly speaks her mind; Kevin hardly speaks. They could never get along. Or so they think.|
|Kiss||I Hate Fanon||M||February 16, 2019|
Though their fics are no longer online, there was an FFN user for several years under the username 'Kevelly' who uploaded several fics featuring the pairing.
|Bed | Betters | Bimmy | Brasther | Brendy | Bribe | Bunelly | Buttus | Candy | Carietta | Cartbe | Cartenny | Catty | Chartters | Cled | Clilly | Clisa | Clybe | Corlisa | Craigbe | Cred | Creidi | Crendy | Crizzy | Damietta | Grendy | Grether | Heiman | Heitters | Henirkle | Henriel | Hensy | Kake | Kannie | Katince | Kelley | Kenally | Kenbe | Kendy | Kenrietta | Keslie | Kevlly | Killie | Kizzy | Kola | Kybe | Kybecca | Kychole | Kydi | Kyenny | Kyndy | Lemmy | Lianed | Litters | Loken | Lolutters | Macksondik | Mactoria | MarLuke | McDanbrady | Mibebe | Micedes | Mutters | Nichoman | Petephie | Philerine | Pindy | Pipbe | Pipella | Ramien | Ran | Reboken | Redman | Renny | Revin | Rimmy | Rip | Roken | Ryle | Scilly | Scolly | Scottphie | Shamir | Sheopold | Sheric | Sherry | Shyle | Sip | Stabe | Stammy | Stanrietta | Starol | Steidi | Stendy | Stole | Tannie | Tenny | Terrizzy | Tike | Tokendy | Tolkole | Twebe | Twebecca | Twendy | Wetters|