Tanjiro: He was crushed and at first didn't believe that it was true. After waiting for Aku after the final fight, he realized that what he had been told was the truth. He broke down crying.
Nezuko: Same as Tanjiro, she did not believe what she was told. It was only after she saw Tanjiro break down and cry that she knew the truth.
Zenitsu and Inosuke: both were considerably upset that Aku had left without saying goodbye. Inosuke never got a chance to fight him so he was angry about that as well.
Rei (alive): cried but understood why Aku decided to do what he did. She was crushed and her and Arukawa spent a lot of time together. Rei took up painting and drew a picture of Aku as memorabilia.
Arukawa (alive): Was upset since Aku and him had just begun to get along. He comforted Rei and himself by spending time with her.
EXTRA INFORMATION:
Aku had the choice of choosing either heaven or hell and due to his personal guilt about what he had done, he chose to go to hell. Meaning he won't have a reincarnation.
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Creation- Demon slayer fanfic
Fanfiction(RE-WRITE IN PROGRESS) Demon Slayer Fanfic(slight AU): A creature, neither human nor demon has become an accomplice of Tanjiro Kamado, a demon slayer. Now, Aku's accompanying Tanjiro on his quest for revenge, however, questions surrounding who he...
