Vamps

Vamps are corrupt programs or Exiles that resemble Vampires. They work for the Merovingian in The Matrix Reloaded.

Second Matrix Beta
The Vamps were first shown in the second Matrix Beta that would bring horror to people. However, The Architect viewed the Beta as a failure and made the Vamps Exiles.

Merovingian
The Vamps serve the Merovingian alongside the Twins.

Trivia

 * They also appear in the video games The Matrix Online, Enter the Matrix and Path of Neo.