I've decided to exclude Ymir and have Mikasa do her part for the sake of the song's storyline.
Mikasa
Yeah, he shows he cares in ways unexpected
But it hurts my heart to aim for the neck
No final words or apology
His eyes alone show him telling me
It's only natural, our love was tempted
Historia
Oh, his heart won't beat again
It's time to end this suffering
We can't let the world end
When there's so much we don't know
All
It's in your DNA, D-D-D-DNA
It's in your DNA
And you'll show him you're not a slave
N-n-n-not a slave
You'll see it too someday
And that's what makes this plan not hard to understand
He loves you anyway, we see it in his face
Nothing more to say
It's in your D-D-D-DNA
Mikasa
It's the green in his eyes that helps me see a future
But giant footprints will cover the ground for days, yeah, hey, yeah
If I only had answered differently
Maybe things would end happily
No need to dwell on it, it's time to move in, oh
Historia
And his heart won't beat again
It's time to end this suffering
We can't let the world end
When there's so much we don't know
All
It's in her DNA, D-D-D-DNA
It's in her DNA
She'll show him she's not a slave
N-n-n-not a slave
She'll see it too someday
And that's what makes this plan not hard to understand
He loves her anyways, we see it in his face
Nothing more to say
It's in her D-D-D-DNA
Annie
It's all about his eyes, that brings her sweet demise
Their energy connect, it's not part of genetics
She's the X to his Y, he won't see her die
He can't get this wrong, he needs to get this right
Convinced of detest, he lies about the rest
Her heart's beating fast, she covers up her crest
He wants to wince in pain, she wants to cry his name
But I guess it's how their made, in their D-D-DNA
All
Ah-ah-ah-ah X4 (Mikasa Woah)
It's in their DNA, D-D-D-DNA
It's in their DNA
She'll show him she's not a slave
N-n-n-not a slave
She'll see it too someday
And that's what makes this plan not hard to understand
He loves her anyways, we see it in his face
Nothing more to say
It's in their D-D-D-DNA