Yayan, Ira. and other character fates, Spoilers obviously.

[Lt.Col. Anon Xer0]

According to Untold tales, Yayan is stuck in 1985
https://www.ciayo.com/id/comic/dreadout/dimensi-lain
https://www.youtube.com/watch?v=K38xNqZvBJI
So unlike the non-cannon ending, he never came out of the closet.

Ira, dead or alive, decided to stick around in ghost town
https://www.youtube.com/watch?v=RZ2oXzrnti4

Shelly is hanging around with her.
https://www.youtube.com/watch?v=VJe6LLoGgR8

Doni, Captain of the Basketball team, has met his untimely end at the hands of a supernatural chiropractor.
https://www.youtube.com/watch?v=FxzM13y_YY8

Ms. Siska had Linda perform gastric bypass surgery upon her with a Kris. It was not successful. So far, she is responsible, directly or indirectly for the deaths of Shelly, and Doni, the Possession of Ira, and Yayan's disappearance.

On the bright side, while Linda has returned alive, mentally unwell, and is hated by the entire school, has made a friend, Professor Mona, who has awarded her with a Doctorate degree in Urban legends and friendship.

So far, Dreadout 2 offers no alternate endings, but it is teased by announcement and in the menu that there would be more content and an epilogue. I look forward to it.
I actually feel like eating pecel lele.

[Sodaykin]

Doni actually died from a Genderuwo, which is also found in the comic which currently is being translated to english Yayans is correct. Ira should still be alive hence the story about Keepers of the Dark and that they are the new Keepers

[Lt.Col. Anon Xer0]

Originally posted by Sodaykin:

Doni actually died from a Genderuwo, which is also found in the comic which currently is being translated to english Yayans is correct. Ira should still be alive hence the story about Keepers of the Dark and that they are the new Keepers

Yeah, apparently he fought some sickle deadlings and was crushed by the Genderuwo, after which the 2nd sister I think possessed his corpse before his final end, of loosening his neck bones in front of Linda for reasons.
Apparently the sisters, the prior guardians are not supposed to hurt the living or something, which raises the question why would they possess or be able to kill Ira in act 2 of dreadout 1. I can only assume different spirits are bound by different rules.

[GØLD3n]

Shelly was killed by Siska too, more specifically by a Gendewuro that she was controlling. You can find this on the comic or in D2. here: https://www.youtube.com/watch?v=Xb86HVUQYAw