I made this chart thing a long time ago for personal use for remembering characters and when one of my two have to interact with one. So I asked Yumi if I could post this if you guys wanna use it :3
You can ignore my side notes on the characters, that was just so I knew who the OC belonged to and kinda how to remember what the character is like XD
The height chart was the most fun cuz its like Alpha and Ryota are giants compared to the others and how they are the tallest yet not the oldest
Comment or PM if you want a larger file :)