Are there characters shared between grand theft auto and other rockstar games?

The verified information about Grand Theft Auto IV focuses solely on its own storyline, setting, and characters, such as the protagonist Niko Bellic. It does not mention any crossover or shared characters with other Rockstar Games properties. Without additional sources indicating a shared cast, we cannot confirm that characters from the GTA series appear in other Rockstar games. Therefore, the current evidence does not support the existence of shared characters between the Grand Theft Auto series and other Rockstar titles.