Shamitako

Both songs echo-y portions that reflect what goes on inside the characters' minds, which isn't exactly something Lyrica does very often. Naturally, they do a good job of further differentiating between the sisters, with one being preoccupied with others' thoughts while the other can't get past her own.

Satori's echoes:

"A monster...

A monster.

A MONSTER!

Stay away.

Stay away!

She's scary...

The way she's looking at me is so scary...

Stop looking at me...

Don't come any closer...!!"

Koishi's echoes:

"Who are you?
Who am I?

What are you?

What am I?

Look at me.

Are you blind?

Look again.

Never mind.

Are you there?

Stay away.

There you are.

Stay away.

Here I am.

Stay away.

Come with me.

Take it away..."

Since Koishi's echoes occur during the palindromic part of Hartemann's Yokai Girl, she has a second one, though only the last two lines actually change.

Similarly, both characters have a four line stanza that really highlights their present view of themselves (at least, that's how I've interpreted them).

Satori:

"Come play my game, for a moment of entertainment... 

To keep my mind preoccupied with memories of beauty.

All my life in a palace of self-containment...

So let me show you what I see, and share with you my duty..."

I get 'domineering lord of the castle' type vibes here, which seems like i would be a common assessment among those who don't know what she's put up with.

Koishi:
"I am just a little figment of imagination!

Nothing but the sort of person no one knows.

For a face to be forgotten is the fate of every face,

Then every pretty smile whithers like a rose."

And here i get carefree traveler vibes, which... pretty much describes what she's been up to as of lat. From the moment the seal on the Former Hell lifted, we've seen her out of the Palace of Earth Spirits than within it- heck, her introductory battle even took place at the Moriya Shrine, of all places! That's gotta be kinda telling, right?