Well, 'voices in my head' often implies some sort of internal mental experience. A 'dark story' related to it might be about a person who is haunted by these voices. Maybe they are voices from past traumas or repressed emotions that lead the character into a downward spiral of a dark and often tragic narrative. For example, the voices could be telling the person to isolate themselves from others, and as they follow these voices, they end up in a very lonely and desolate situation which forms the core of the dark story.
Here's an example. A soldier returns from war and has voices in his head. These voices are of the people he couldn't save. They keep telling him he's a failure. The dark story unfolds as he tries to drown out these voices with alcohol and drugs, but instead, he ends up losing his family and job, and sinking deeper into a dark hole of despair.
Perhaps the 'dark sould squid head things' are antagonists in the story. They could be malevolent beings that are out to cause chaos or harm. They might have special powers or abilities that are related to their squid - like appearance, such as being able to blend into the darkness or use their tentacles in a menacing way. However, this is all speculation until we have more information about the 'dark sould squid head things story'.
I'm not sure exactly as I haven't read it. But generally, it might involve a story told through dark and moody illustrations. It could be about characters facing some sort of internal or external struggles, perhaps in a spooky or mysterious setting.
I don't know the specific main characters since I haven't read it. But they could be characters who are somehow connected to the voices in the dark. Maybe a detective - like figure trying to solve a mystery related to these voices.
In the 'Head Chimney' story within 'Scary Story to Tell in the Dark', the chimney is more than just a structure on a house. It becomes a portal for something sinister. The head - perhaps of a long - dead person who met a grisly end - is associated with the chimney. As the wind howls outside, you can hear scratching from inside the chimney as if the head is trying to claw its way out. It's a story that plays on our fear of the unknown and the spooky places in old, dark houses.
The main voices in Toy Story are Tom Hanks as Woody, Tim Allen as Buzz Lightyear, and Joan Cusack as Jessie. There are also many other talented voice actors who bring the various toys to life.