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Abyssopelagic
I have Echokit for a friend, or best friend, or possibly even a safety net.
Echokit
She is a cursed child. With what, you may ask? Echo's Curse. Just like in the greek tale of Echo and Narcissus, she can only speak after someone else has spoken, and can only repeat back the last words of what was said. Eventually Echokit might get frustrated with her incapability to communicate effectively, but she'll learn to accept it over time.
Because of this, I could see Echokit trying to learn some form of sign language. Maybe they could learn it together!
Echokit would have a strong sense of quiet stability that Moonkit could lean on in the future. She's going to be close to a select few cats, and Moonkit could be one of them. She'd be extremely loyal to them, being more open and relaxed around her friend group. She has a sense of fun and adventure, and humour, so that could be interesting as well. Echokit will definitely try to help Moonkit as best as she can, not running away when Moonkit gets frustrated and lashes out.
She will definitely side more with her friends than anyone, and defend them even if they got into trouble. She has a rebellious streak, which could to lead to future shenanigans.
Overall I think it'd be really interesting if they could interact and form a close bond!