Circle and Square are the same age, the younger sibs who constantly bicker around. Triangle is the middle sib who tends to be left out. Pentagon is the older sib with lots of heavy expectations on her.
The weapons you see were given by the Treeangle itself as a gift. They got it during the Rebuilt of Paradise as secrets start to uncover of what's hidden within the land.
Cube is a single father and is gentle and caring, doing most of the housework while also spending time with the Players. CTM, his brother, is the hard working uncle who is relaxed but also strict in some ways.
When CTM got Corrupted, his mind was very disoriented and had lost both arms. New Games was able to help by giving him prosthetics yet had difficulty trying to calm him down from his hostility.
Corrupted shapes during the Corrupted Era(aka the stuff that happens in sotrymode) tend to be hostile. Originally, they were never hostile in the first place but because of this sudden change AND using the Treeangle as some sort of power beacon- there were some faulty leaks within the who progress.