Besides L, Light, Matt, and Mello, were there any other death's that were tragic to you?

Yep. Naomi and Light's father.

I found that scene with Naomi walking to her noose chilling, especially when she found out that Light was Kira a moment before. As for Light's father- he died not knowing the truth, and he died with his son trying to use him. I thought that was very tragic. His son was zaidi concerned with killing someone than his father dying.

Naoimi- Wow i felt so bad Light made her kill herself.

Soichiro Yagami: Light's father's death was so sad. He died not knowing the truth. His own son didn't even care...
Takada- No one really mentions her. She was intelligent, kind, and Independent. She died alone, naked and was forced to set herself on fire.
Misa: I'm pretty sure Misa killed herself kwa jumping off of a bridge at the end of the series. It's pathetic but it also showed how much she cared about Light