Ace and Cryotron have a very bumpy road ahead of them leading to their friendship, if you can even call it that. It's more like a "I'm being forced to take care of you but If either of us die, the future will die along with us." sort of relationship.
Ace wants what's best for his team and teammates always but his team doesn't seem to know that their lives are in his hands... So it's. Very hard for Ace to care for them and be nice at the same time. They're a reckless bunch. Especially Cryotron, as they live everyday like it's their first and last.
Ace: I've learned a lot of things about you from your parents, New guy. Many "interesting" things...
[Flashback]
Mettaton: PLEASEEE take good care of our kid!! He's a good kid! Very smart-- a-and he'll listen good-- and--and...He's not like the other monsters but they're VERY perceptive a-and kind and handsome and cool--
Mettaton: And if you want to know more I can share his personal handling and building manual, darling!
Ace: What.
Papyrus: Indeed! It even comes with his baby photos, his medical records, his favorite food, his favorite color--
Papyrus, Continued: His quirks, their magic even though they don't use it often, who their first crush was, how flexible he is, how he showers, the inside of his--
Ace, in his head: Eh...? ...Please shut up... Stop... Stop talking... I Don't care-- DONT PISS ME OFF!
[Flashback END]
Ace: WELL-- Mostly "interesting" things ... (things I will never be able to unhear)
Ace: Most importantly, I heard that you speak only in Morse Code, Is that correct?
Cryotron: (In Morse Code) Yes.
Ace: Ok cool, I don't want to deal with that so you'll just be the silent stealth guy. Ok?
Cryotron: ...
Cryotron: [throws a thumbs up and in his text makes a thumbs up. Somehow.]
Ace: I know you can't use your magic, and I also heard you've actually never been in combat before. I don't have time or care enough to train you so, here.
Ace, after giving Cryo a gun: I entrust you know how to use one of these, at least?
Cryo: ...
[Cryotron holds his finger on the trigger and points the barrel of the gun towards his face curiously. Ace snatches the gun from him]
Ace: GIVE me that.
Ace, giving him a knife: HERE. If you attempt to kill yourself with this SOMEHOW, then you better do it RIGHT or NOT AT ALL.
Ace, leaving: Fuckin' unbelievable... stupid android. Robot fuck.
Cryotron, thinking: :(