Ken Takagi, also known as Lock Hero: Rock Lock is a Pro Hero. Ken is a very pragmatic and blunt man who is quick to judge whether or not someone is an asset. He is especially critical of newbies and young students, aware of the fact that they are possibly children risking their lives in dangerous situations. His infant son makes him more cognizant of the students' young age than the other pros. He is often annoyed by inexperience. Ken is also prone to strong confidence in himself and his allies, as he is certain that the enemies would cower in fear and surrender or run away.