Мафия 9. Mage Valley

Okay, let's go over the clues.

Regarding Guru:

The killer scratched the simplest children's rhyme on the wall.

That is, the clue is either children, or the rhyme, or both.
Right away, Luchik comes to mind, but a similar clue was in the previous mafia game, so it's unlikely, but I don't think we should rule it out.
Next, Hermit – there are children in his avatar, we should also remember that. And in general, many have some kind of poems (song fragments) written in their signatures...
Maybe the answer is hidden in the second part?

Chiki-briki, throw out your finger.

But I don't even know what to think here...

Regarding Kostyan:

And beneath it lies a magical artifact left by the criminal, which should awaken its owner at eight o'clock.

The first associations are clock – alarm clock...
There is a clock on Xostor's avatar.
And Revan has quite a lot about time in his signature.
Or maybe we should look for the number eight? Ar immediately comes to mind, but

"I listened to the most wonderful music from another world all night and slept perfectly," Arandor shared.

That is, his Portal Creator was blocking him... :( because

Portal Creator – Ilsor, a short mage, grandmaster of mysticism, sends one of the council members into astral sleep every night.

Or maybe the number eight can be connected to the Witch, she has "child of the online world" on her avatar – eight different icons are drawn... but something tells me that this is a barbershop...

In short, I'm completely confused right now.