Ethir Neechal

Kunchithapatham's unique name becomes the butt of joke and ridicule for others. He relates his failures to his name and wants to change it. He meets an astrologer who is popular in giving fancy names that could bring luck to people. His named his changed to Harish and soon after his luck changes.

Sivakarthikeyan

Kunjithapatham/Harish

Priya Anand

Geetha

Nandita Swetha

Valli

Jayaprakash

Coach

Ravi Prakash

Raja Singh

Sathish

Peter

Surekha Vani

Kunjithapatham's Mother

Suza Kumar

Kunjithapatham's first love interest

Manobala

Astrologer Gunashekar Raja

Madhan Bob

Office Manager

Dhanush

Special Appearance in "Local Boys" Song

Nayanthara

(Special appearance)

Anirudh Ravichander

Bar Waiter (Cameo Appearance)

Balaji Patturaj

Himself (Host Of Chennai Marathon)

Dinesh Ravi

Dinakaran