Since IKEMEN Plus GO is in active development, it seems like base IKEMEN is going to be outdated.
Here is an old tutorial presentation I've made:
Spoiler, click to toggle visibilty
My team is creating a Sonic Fighting Game using IKEMEN so I put together this guide so everyone on my team understands how the engine works. I've modified this presentation so it's better suited to the general public. Most of you will already know all of the information on here. But, maybe someone else could find a use for it. I would add more, but information I've discovered I'm not 100% confident in it's validity. If I have anything incorrect, feel free to let me know. I believe I can still edit the information while it's published.
Good luck on your endeavors.