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Despite having only 7 months of experience with MUGEN at the time this topic is first posted, I've decided to start my own character project roughly late May after expressing interest from tinkering with pre-existing characters in my MUGEN roster. While this character takes Otz-Kai's Sayaka Miki as a basis for most of her sprites, sounds and gameplay concepts, she is otherwise built from the ground up tailored to my own idea for a custom gameplay style. She's currently in late alpha stage as of this post date, but she'll likely be ready for beta in a month or two as she'll need a bit of cleaning and fixing before then.
Teaser from about a week into making the character: https://www.dailymotion.com/video/x6ledv3
The progress made about a month after the first teaser: https://www.dailymotion.com/video/x6ohcme
Showcasing Sayaka's supers:
Sayaka's comeback gimmick: https://www.dailymotion.com/video/x6pcrad