Well, good! I found some information. I doubt this run I can get the secret mermaid character on my Umino, but...
On the Japanese OceanWhen Planktontchi changes to Kuragetchi you must take perfect care of Kuragetchi. Hearts should always be full, discipline should be full, and you must ward off all polar bear attacks. If you've taken perfect care of Kuragetchi he should change to Otototchi after 2 days.
Once you get Otototchi you'll have to switch gears and take poor care of Otototchi. Let his hearts empty, then fill only 2, let them empty again, then fill only 2...repeat as necessary. Never fill more than 2 hearts. Try NOT to discipline Otototchi. It may be necessary to discipline him once to get him to eat (otherwise he will starve and cease to exist). You'll still need to ward off the polar bear in this stage since an attack could kill Otototchi. If you follow this care pattern with Otototchi after 2 days (at 4yrs old) he should change into Kaitchi. (There are a few variations in care of Otototchi that will still lead to Kaitchi...lack of discipline seems to be a constant, the most important aspect.)
Now that you have Kaitchi you switch gears again, and take perfect of him. Hearts should be full, discipline should be full, and you must ward off all polar bear attacks. After 2 days Kaitchi at 6yrs old should turn into the secret character, Ningyotchi.
It is important NOT to pause the Ocean throughout it's life cycle.
Since I have paused mine is why I doubt I can get her, but I can try. At least I have the right idea with no discipline.
I also found out that I should NOT play games with the Morino when raising it, that's how you get a good character (since it'll fatten up more). Fat = good, LOL.
I ALSO read that there's still hope for Bowser becoming something good. Since I took such good care of Venus, I don't think I was supposed to actually see her lay an egg or anything.
Random evolved into Ura Mametchi a little bit ago, as I figured he would.
He'll probably get a job soon, but I think I'm going to use the breeding coupon before then (I'm not sure if I can use it right away or not)... *Attempts*
Nope, he's not old enough. I think age 9 or something is when he's old enough to mate (when the matchmaker will visit). So, 2 more days.
That's it for now! Hopefully by posting that info on the Umino it'll help with anyone that reads this--I did a lot of digging for that info. I added the link, too, in the quote. That's what she looks like, I guess, but I will get a picture of her pixelated if I get that far.