JusticeItEasy said: Maybe the time abandoned tonnd down her scum only to resurface again when she was adopted?
Seems the opposite to me, this seems to show a baby marisa being very nice to her miss.
I'm leaning towards the "easily scumified by stress" perspective. Marisa seems nice enough until they ignore her greeting when she is "born", and the distress from not being greeted back makes her a shithead with the cuteness logic.
The thing is they didn't ignore her, she just suddenly started tantruming out of not getting "an answer" and even that is debatable, after all they pretty much told her to wake up and all, other babies yukkuri have more patience than that, or just try again until they get tired, this one just tried once and randomly started to tantrum about how cute and awesome she's, etc.
Ok, I think I got it. There are parts that are still speculation but it kinda makes sense this way while keeping with the theme.
1. Marisa is born scum. 2. Marisa is showered with kindness by her parents(/owner?) 3. Marisa ultimately does something to be abandoned. 4. Between the time Marisa is adopted by Miss and becomes scum, Marisa adopts a "nice" personality. 5. After being spoiled by Miss again, she relapses back to 1. 6. Surgery in story takes place, and "resets" Marisa back to step 1 for good. 7. Anon says fuck it and kills Marisa.
That's pretty much what I was thinking that happened.
SCRAPEOh, how kind of you.Yuyu!? That'sh not it, je!Aww, Maricha, you like lots of attention, don't you.yuyuunMi..sh...Eajy! After all, Maricha LOVESH! Mish! je!Mish alwayj letsh Maricha take it eajy, sho Marisha ij sharing her eajinesh, je!*gleam*flap flapruuub ruuub