The following characters appeared in the episode "Minding Motsuki":
Luna Girl arrives at PJ Masks HQ and asks Gekko, knowing that he's handled babysitting before, for help when Motsuki refuses to do what she says. Gekko shows Luna Girl that Motsuki's not a baby, and she shouldn't be treated as one.
Do not treat others like a baby; they will not like it.
This is the first short that Motsuki appears in.
It is revealed by Gekko that Motsuki is supposedly not a baby, even though she clearly acts, and talks, like one.
This is the second time one of the PJ Masks is alone in their HQ.
This is also the fourth time Luna was invited into HQ, the first three being the aforementioned episode and "Best Friends Forever", as well as the short "Moon Rocked".
This is also the third time Motsuki enters HQ, as well as the first time she has done so in her insectoid form. The first two times were "Moon Madness" (her debut episode) and "Best Friends Forever", both when she was in her moth form.