L and Near never appeared together at any time. At the time of Near's first appearance, L was already dead.
It was also implied by Mello (in Nishio Ishin's spin-off novel, Another Note) that although he met L at one point, Near had not. Near has even said (in the post-series one-shot) that he never met L in person.
it should be the 1st or 2nd episode after l died witch was episode 25 i think
L thinks he is kira .... duuuhhh
Near was first seen on the last scene on Episode 26 of Deathnote who was inform that L was dead. This was also the first time that Mello was seen in the anime.
He doesn't they just showed him because near was talking about him.
Mello comes into Death Note in Chapter 60, in Volume 7, after L's death. He and Near are the two possible successors to L, but Mello refuses to work with Near and decides to go after Kira on his own, kidnapping Sayu, Light's younger sister.
L dies in episode 25, "Silence" Episode 25. The saddest episode besides 37. -B.
L shows up in episode 2.
The episode when L dies, 25
L didn't sing in an episode its just the voice you hear
I'm not going to ruin the plot for you, but no. He never comes back in the show. If only... well idk but some people said that near used the death note eraser and l came back..
Near first appears in episode 26, appearing in most episodes after that.
L says "Justice will prevail" and smiles in episode 6.