The correct answer is Vasu from The Man-Eater of Malgudi because his character perfectly aligns with the idea that a demon carries within himself a "tiny seed of self-destruction" and perishes unexpectedly.
Explanation:
Vasu is portrayed as an aggressive, egoistic, and destructive taxidermist who represents the asura (demonic) force in R.K. Narayan’s novel The Man-Eater of Malgudi. His actions, such as poaching animals and disrespecting traditional values, make him a villainous figure. However, his downfall comes in a highly ironic and unexpected manner—he accidentally kills himself while attempting to swat a mosquito on his forehead.
This aligns exactly with the quote: Vasu, the "demon," unknowingly carries his own destruction within him, and he vanishes at the most unexpected moment. His arrogance and violence ultimately lead to his ironic and self-inflicted death, making him the best fit for this statement.