'I got scared and they appeared out of thin air'

I came across a song on my phone titled 'Schizophrenia' by Jukebox the Ghost - because schizophrenia have a relationship with paranoia, I decided to read the lyrics and try to understand what the song is trying to say about it for inspiration:-

Yes I can, no I can't,
Yes I can, no I can't,
Yes I can, no I can't,
Yes I can
I swear to it,
That's just how my brain works.

Yes it is, no it isn't,
Yes it is, not it isn't,
Yes it is, no it isn't,
Yes it is
I know that,
I know it sounds absurd but

We first met in the summer of my twenty-second year,
I got scared and they appeared out of thin air.

Here they come, here they come,
Here they come, here they come,
Here they come, here they come,
They're after me.
I don't know anything.

They got guns, they got knives,
They got guns, they got knives,
They got guns, they got knives and spies,
I am no informant.

We first met in the summer of my twenty-second year,
I got scared and they appeared out of thin air...

They knew my name,
They screamed and screamed,
They knew everything.

You could say that I'm well liked
But I'll never be friendless...

You could say that I'm alright
Or you could say schizophrenic...

This song is about the inner battle with one's mind - when someone is diagnosed with schizophrenia, it is usually because they have hallucinations or are hearing voices. In this song, the character says he had his first hallucinations in the summer when he was 22. He was scared, mainly because his hallucinations appeared out of thin air with guns and knives. They also knew everything about him; because they were, to put it simply, part of his imagination. He also mentions that he could 'never be friendless', saying that his hallucinations will be his friends. Nearing the end of the song, he admits that he's schizophrenic.

IDEA:

• I like the idea of my main character hearing voices - from someone or something who isn't even there - a character made up by her/his imagination
• character meets this ghost/monster thing (a personification of fear) that first appeared out of thin air - no one else can see, because it is just a figment of her imagination - it whispers false words to the character and makes him/her paranoid about things, makes him/her think and see things like how the monster tells him/her.
• first few pages of illustration could be done in two colours - a dark colour (maybe just keep everything greyscale) with a different colour to highlight character and his/her hallucinations.
• as he/she gets better, pages gradually turns full colour to show that the monster is:-
• weakening, have less control of the characters mind (what he/she thinks and what she thinks she's seeing)
• show that the character is happier, is free - that their world is more colourful