Near and Mello are two brilliant successors of L, and they challenge Light Yagami's plans as Kira in the anime "Death Note" by using different strategies. Near is more methodical and relies on logic and deduction, while Mello is more impulsive and willing to take risks. Together, they put pressure on Light by disrupting his schemes, forcing him to adapt and reveal more of his true nature. Ultimately, their combined efforts lead to a dramatic showdown that tests Light's intelligence and resolve.