Do gta characters appear in any non rockstar games?

The available source only describes the Grand Theft Auto series as an action‑adventure franchise created and developed by Rockstar North and published by Rockstar Games. It does not mention any crossover appearances of GTA characters in other game titles or franchises. Because the evidence provided is limited to the Wikipedia entry on the series itself, we cannot confirm that GTA characters have appeared in any non‑Rockstar games. If such crossovers exist, they are not documented in the cited source.