Soldier Kid makes his debut in "Headhunters," at the grand re-opening of the Mystery Shack's wax museum and the unveiling of Wax Stan. He, like everyone else who shows up, is upset by Grunkle Stan's lie about serving free pizza at the event and storms off.
He then appears in "The Hand That Rocks the Mabel," putting money into Stan's Sack of Mystery, cheering as Gideon Gleeful's tour bus arrives in Stan's flashback, and attending one of Gideon's shows at the Tent of Telepathy.
In "Summerween," he trick-or-treats at the Mystery Shack with a group of his friends and, unlike the others, with the exception of the Mummy Kid, is not initially scared by Stan. Stan, not content with only scaring away three of the kids, tries desperately for several hours to frighten the braver two, through methods like faking pulling out some of his guts and pretending that Waddles jumps out of his chest. Soldier Kid and Mummy Kid continually demand candy, terrorize Stan and throw toilet paper all over the Mystery Shack. Eventually, the boys enter the Shack in hopes of convincing Stan to give them their treats, but end up getting scared and running off when they see Stan, who is preparing to take a shower to "wash off his shame," naked, leaving the bags of candy they had previously obtained at the Shack.
Though the kid has the potential to be friendly, particularly toward other children, he displays a smart-alecky, meaner, and more persistent side as Grunkle Stan refuses to give him any candy, possibly traits he only expresses when agitated or with adults. Due to frequently watching horror movies since a young age, he is not easily frightened. He has also been known to be somewhat naive and oblivious at times.
He is fair-skinned and has short brown hair and a stout physique. He typically wears a dark blue and white baseball cap, a green tank top with a camouflage pattern and dark blue shorts with a single yellow stripe on each side. He often wears white socks and brown shoes, though he does go barefoot sometimes. He carries a bag containing candy in "Summerween."
- 103. "Headhunters" (no lines)
- 104. "The Hand That Rocks the Mabel" (no lines)
- 108. "Irrational Treasure" (no lines)
- 109. "The Time Traveler's Pig" (no lines)
- 110. "Fight Fighters" (no lines)
- 112. "Summerween"
- 115. "The Deep End" (no lines)
- 116. "Carpet Diem" (no lines)
- 120. "Gideon Rises" (no lines)
- 5. "Tooth" (flashback, no lines)
- 206. "Little Gift Shop of Horrors" (no lines)
- 208. "Blendin's Game" (no lines)
- 220. "Weirdmageddon 3: Take Back The Falls" (no lines)
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