Oh sorry to hear about your news about quitting MUGEN..........
Actually I tried to be studying your Rosalina (the 22/3/2015 version you sent to me by PM) and found there are a number of things that might need to do and/or re-do.
Your idea and passion in MUGEN are admirable; at least you care for the video game characters you like and you are willing to bother to give them a try for MUGEN and share with everybody.
Although I am not a good MUGEN author by your expectation, I might be able to help you update your Rosalina to make her less "spriteswappingly" (most are basic stuff like Required Sprites and re-animations and collision boxes re-adjustment and some MUGEN code cleaning and tweaking that need some attention, as well as the A.I. issue that troubled you so much (?) -- I found some A.I. MUGEN code in your Rosalina being linked to non-existing states/animations, and oh, still using the old Command = "CPU" A.I. activation way.......not good for MUGEN1.0/1.1
). So if you trust me then we can discuss more about your Rosalina update.
>> I prefer making platformer games...
Engine 001........never heard of this one......yet, MMV has a OpenBOR section here: http://mugenmultiverse.fanbb.net/f51-openbor-general-discussion-area
Anyway, good luck in whatever plan you are having and have fun and come to MMV again!