Sunil Kumar was born to veteran
Janata Dal (United) leader and parliamentarian
Baidyanath Prasad Mahto. Sunil is considered as a mass leader and is known for groundwork and frequently visiting his constituency and his voters. In 2022, after the tragic incident of shootout at the residence of
Narkatiaganj based businessman Guddu Barnwal, he announced that he could even lift the weapon to protect his people. He justified his statement by reminding his constituency that his father Baidyanath Prasad Mahto formed
Gram Raksha Dal Shaheedi Jatha to take on the bandits of Champaran region in early nineties and he can trace the footprint of his father for the welfare of his people. In his first tenure as a parliamentarian, he raised the matter of National Highway no. 727, which was not completed in the span of four years causing difficulties to the people. He also pointed out that near
Lauriya toll tax was being collected despite the fact that the service was not being provided to the commuters properly. In 2023, he also raised up the issue of reconstruction of Valmikinagar Airport for the promotion of tourism in the region. In his parliamentary address given during Zero hour, he drew the attention of the seat of
Lok Sabha on the importance of Valmikinagar constituency, given its proximity to
Nepal. According to him, being connected to
Sita of
Ramayana and harbouring the only tiger reserve of Bihar, presence of a functional airport may boost the tourism potential in the region. ==Second term (2024-29)==