hirot78 (@hirot78) is an IT infrastructure consultant who specializes in cloud computing. He was also one of the first makers to try out Stack-chan.

(https://twitter.com/hirot78/status/1441561937326723079)

...Six of them! Even I, the original creator, have never made that many Stack-chans at once. He used my documentation as a reference to assemble and mount the parts himself, and successfully built all six.

(https://twitter.com/hirot78/status/1443822629635256320)

In addition to the SG-90 case, he used my Stack-chan board and ModdableSDK-based JavaScript firmware.
The firmware was not yet SG-90 compatible, but he implemented the SG-90 driver on his own.

(https://twitter.com/hirot78/status/1436203420839415822)

(https://twitter.com/hirot78/status/1437728684484354050)

There are several variations of the M5Stack module. He scrounged up all the M5Stacks in the house to complete his robot, which included versions of M5Stack Basic, M5Stack Gray, and M5GO. I am happy to see all versions working.

(https://twitter.com/hirot78/status/1446600296554065922)

His 4 year old son also held one of these devices and played with it until the batteries ran out.

(https://twitter.com/hirot78/status/1444266552816140292)

This video is from a Stack-chan meeting.

(https://twitter.com/hirot78/status/1446600690499919873)

See there is one robot whose servos are vibrating in small increments? He describes this child as having "unique movements", which may be a result of the fact that he built it with his own hands and became more attached to it than a ready-made robot.