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He is the founder of the well-known Future gadget laboratory as well as Hououin Kyouma, the mad scientist.
His loud laugh resonating across Akihabara actually comes from his kind heart, which is his (Okabe's) charming point. As you see, he is very nice and kind only for all the female characters to fall in love with him. (Exactly speaking, one of them is a man...)
He leaps time several times to save Kurisu Mayuri taking the spear on his chest; this scene touches everyone's heart. The final time travel to the ending is a spectacle as well.
"Hey, this is me. Got disturbed by the organization. EL PSY KONGROO."