1. Unnamed Senpai: The unnamed senpai, an early partner of Kisame, was killed by a Fire Style jutsu during a mission. He was considered expendable due to his lack of strength. 

2. Raiga Kurosuki: Raiga, a member of the Seven Ninja Swordsmen of the Mist, defected to Akatsuki. He met his demise when his own decapitating sword was used against him by Yagura, the Fourth Mizukage. 

3. Baku: Baku played a vital role in Akatsuki's early stages and was revered by Yahiko. Though skilled in Water and Earth Style jutsu, he sacrificed himself in an encounter with Nagato and Konan during a failed plan to overthrow Akatsuki. 

4. Daibutsu: Daibutsu, a rogue ninja and elder figure in Akatsuki, died in battle while supporting Yahiko. He was defeated by Madara and Kabuto's Wood Style jutsu.