Hailing from a poor toddy tapper's family, the 72-year-old CPI(M) leader belongs to the politically dominant Thiyya community like his party rival Achuthanandan, who is an Ezhava from South Kerala.
Popularly known as 'Pinarayi', Vijayan is a party politburo member and perhaps the only communist leader in recent years to have had a complete control over the party for 16 years till he stepped down from the post of state secretary last year.
The cloud of a graft case in connection with awarding of contract to a Canadian company SNC-Lavalin for modernisation of three hydel projects during that period haunted him with his rivals using it to target him.
Vijayan has always maintained that it was a politically motivated case and there was no wrong doing.
While his critics described him as a leader "with no smile on his face, and the most feared politician in Kerala", his party rivals have often accused him of deviating from the party line.
His elevation to the Chief Minister's chair is also seen as a victory in the bitter power struggle with Achuthanandan, a popular leader who campaigned extensively during the Assembly election and was in the race for the top post.
Vijayan was suspended from the politburo in 2007 along with Achuthanandan after the two openly criticised each other through the media. Later they were reinstated in the politburo. However, Achuthanandan was again dropped from the highest party body for breaching party discipline.
During his tenure, the state witnessed a giant leap in power generation and distribution capacities due to the productive measures taken by him as a minister.
Vijayan was born on March 21, 1944 to Mundayil Koran and
Kalyani in Pinarayi in Kannur district, the place where the Communist movement in Kerala began.
He became the Kannur district secretary of the Kerala Students Federation while studying for BA (Economics) in Brennen College in Thalassery and also worked as a handloom weaver after his schooling for a year before being able to continue his higher studies.
Two years later, the party gifted Vijayan a sure ticket at Koothuparambu and he became MLA at the age of 26.
Vijayan was elected to the state Legislative Assembly three times later in 1977, 1991 and 1996. He rose to prominence when he won in 1977 and again in 1991 from the same constituency. With better grip on the party, he became the CPI(M) district secretary in Kannur in 1978.
After his release, he came to the Assembly and made a powerful speech holding up the blood-stained shirt he wore during the assault on him in the police lock-up.
His speech attacking then Home Minister and senior Congress leader late K Karunakaran was considered to be a glorious chapter in the legislative papers.
