After completing his training, Kumaran became a teacher at St. Joseph's European Boy's High School in Calicut in 1897.

[3] He then became a teacher at St. Joseph's Convent, and it was during this time that Indian women in Malabar started education in English schools.

The story was returned by two editors until finally accepted by Kandathil Varghese Mappillai who published it in Malayala Manorama on 22 February 1896.

[3] Then the next story called Anyatha Chinthitham Karyam Daivamanyathra Chinthayel was published in Bhashaposhini, also by Varghese Mappillai.

[11] Kumaran was also one of the early novelists who wrote seven novels namely Lokapavadam, Kanakam Moolam, Jahaneera, Rajaputhra Viwaham, Ambu Nair, Vasumathi and Vellikkai.

He also penned the prose collections Kakan, Gadyaprabandham, Gadyamanjari and Asan Vimarsanathinte Aadya Rasmikal.

[11] After writing Kakan (Crow), which was based on an article by ornithologist Douglas Dewar, Kumaran wrote extensively on science.

He wrote articles on insects, flies, mosquitoes, beetles, ants, termites, cockroaches and wild lice.

He also translated the book Wonders of Physical Science by Edmund Edward Fournier d'Albe into Malayalam under the title Prakriti Shastrathile Albuthangal.

Kumaran also wrote the biographies of O. Chandu Menon and Vengayil Kunhiraman Nayanar and has also written biographical essays on Kandathil Varghese Mappillai, Kerala Varma Valiya Koil Thampuran, A. R. Raja Raja Varma and Kumaran Asan.

[13] He wrote many articles in prominent newspapers of the time under the pen names of Gajakesari, Patanjali, Vajrasuchi and Pouran.