Karthika Adaikalam (born May 3, 1991), better known mononymously as Karthika, is a Tamil film actress, who has appeared in Tamil films. She is probably best known for her performances in Thoothukudi and Raman Thediya Seethai. Karthika Adaikalam (born May 3, 1991), better known mononymously as Karthika, is a Tamil film actress, who has appeared in Tamil films. She is probably best known for her performances in Thoothukudi and Raman Thediya Seethai.