Takuma Onizaki
The first guardian the main character meets and also her classmate. He has much strength, but is also quite slow. His hobby is doing crosswords and he enjoys eating taiyaki. He is the descendant of the oni, whose power is very hard to control, especially when near the sealed magical sword Onikirimaru. He gets along very well with Tamaki and is very close to her.
In 2nd season, Tamaki and Takuma kiss and their feelings for eachother develop closely as they place their trust mostly in each other, from Tamaki’s grandmother especially. In the end, they part but see eachother every year when Tamaki visits the shrine.