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Saiji Tatemiya (建宮 斎字)Currently the substitute-Supreme Pontiff of the Amakusa Catholics. He has impressionable pitch-black hair and a unique sense of fashion. He wears an over-sized shirt and his shoelaces are one meter long. He is an expert in Amakusa-style combat and is equipped with a 180-centimeter-long Flamberge.
In terms of personality, he's similar to Touma. He doesn't need a reason to save people, which resulted in him attempting to help Ursula. This was due to him wanting to rebuild the Amakusa Church into something that can be called a home to Kanzaki Kaori again, so she doesn't need to leave them again to protect them from getting involved in incidents due to her powers of a saint.
(Source: Toaru Majutsu no Index Wiki)