Ken uses a spear as his weapon and Koromaru fights with a kunai. As far as Personas go, Ken will have Kala-Nemi on his side and Koromaru with Cerberus. They’ll make a formidable duo with Ken excelling at long-ranged fighting and Koromaru’s speedy attacks.
For their instant-kill, both characters will be using their Personas at full strength, to pull off a powerful attack consisting of Kala-Nemi’s light attribute and Cerberus’ darkness.
Like most of the other characters in the game, Ken and Koromaru will have their Shadow-types. Famitsu doesn’t share too much details on the story behind the two, but it shows a glimpse of Shadow-type Ken saying, “Haha, what? You’re afraid of fighting a little brat?”