So, Siren is trying to recreate SKK's face through details that Mihara can "kinda recall" and by vaguely describing his personality. Siren thinks SKK sounds like a prince-charming/perfect person, and vaguely recalls that she "also knew someone who was kinda like that". This made no sense going by Old Tales, and my trannylator sense was tingling, so I decided to look at the JP and KR if that could clear it up.
Little Mermaid: Ugh...
Little Mermaid: "I feel like I know someone like that too..."
Mihara: Huh? There are others like that?
Little Mermaid: Yeah.
Little Mermaid: "Yeah... That legendary person also seemed like that, I think."
Little Mermaid: "...Hmm. If I imagine that person, I might be able to make it."
Little Mermaid: "Wait just a moment...!"
The Little Mermaid closes her eyes and waves her hand over the water bubble...
The face of “someone” was completed
Mihara: Ah...!
Little Mermaid: "How is it? Does it look right?"
Mihara: ...Maybe.
Mihara: In my memory, faintly... That face matches.
Mihara reaches out toward the face of “someone”
Mihara: I hope I can remember your name someday.
Mihara: ...I want to meet you.
>Legendary
So, JP/KR clarifies what she meant; she meant the Legendary Commander.
>Siren: That legendary person also seemed like that, I think
LSKK must have looked like a hero/prince during the first invasion, since the Goddess Squad was constantly on television and doing PR. Cinderella used to watch them a lot on television. She used LSSK's face to mold SKK's face, and Mihara felt it was accurate. Now, that is interesting.