Tachigami (Rending God) is the Celestial Brush God of cutting/slicing and the Celestial Brush Technique Power Slash (Issen, One-Flash) which grants the ability to cut through foe and obstacle alike. He takes the form of a rat with a huge sword and had hid among the constellations to escape the evil of the world below but was revealed by the repair of a sword on a statue dedicated to an ancient hero. He is one of the few original brush gods from Ōkami to return in Ōkamiden but his children are the ones who speaks to Chibiterasu.
The thirteen Celestial Brush Techniques are each a different brush stroke, mark, or symbol capable of controlling the time, elements, environment, ect as "good brush work has its own soul" and have taken on the form of one of the Chinese zodiac animals. They are born of and wielded by the sun goddess Amaterasu for whom they hold great respect as their ‘mother’. Anyone can use the Celestial Brush Techniques but years of practice are needed to master them unlike Amaterasu who is the only one known to have and been able to possess all thirteen techniques. A Celestial Brush Technique can be canceled out by drawing the same symbol over it.
"It's been a long time. But with all these monsters around, the only place I could hide was in this shrine dedicated to ancient heroes. Make good use of this sword, as it was designed to conquer evil." -Tachigami