Who is Sandip Babu from The Home and the World and what is their importance?

Sandip Babu is one of the main characters in this novel, as well as one of the narrators. Sandip resides in Nikhil's house as a guest, but he pursues Bimala, engaging her in matters concerning the Swadeshi cause. He is a very selfish and greedy individual who masks his true identity by feigning care for his country.