Alex/Sivan (played by C. Arun Pandian) is a protagonist in Sivan.
Sivagami (played by Radikaa Sarathkumar) appears in Sivan.
Murugan (played by Napoleon) appears in Sivan.
Shenbagam (played by Swathi) appears in Sivan.
Murugan's mother (played by Janaki) appears in Sivan.
Ahana (played by Ahana) appears in Sivan.
Special Appearance (played by Kalyan Kumar) appears in Sivan.
Nattu (played by King Kong) appears in Sivan.