seré yo quien

I will be the one who

→ ser
phrase Rare #48,056
I will be the one who An emphatic way to say that the speaker will be the person who does something. It is often followed by a verb in the subjunctive, such as ponga, discuta, or salga.
SP: Seré yo quien se encargue de llamar al médico.
EN: I will be the one who calls the doctor.

Adelante, seré yo quien ponga orden en esto.

Go ahead, I'll be the one to put this in order.

— Игла (1989)

Probablemente seré yo quien tendrá que hacer eso.

I'll probably be the one who has to do that.

No seré yo quien te lo discuta.

I’m not going to argue with you about that.

Seré yo quien salga.

I'll be the one who goes out.

— Solaris (1972)