[The question is surprising; coming from anyone else, Eren might find it almost offensive, but he doesn't respond that way with Maruki. He seems to understand why it's at least worth asking - and it's not as though he hasn't considered it, if only with an idle, passing thought.]

I consumed three titan shifters to obtain three titan shifting abilities. I've wondered if it would be possible to only get rid of one.

Of course, I wouldn't let go of the Founding Titan. That leaves the Attack Titan and the Warhammer Titan.

The Attack Titan is what I've known the longest. I'd give up the warhammer titan if I had to decide.