Board Thread:Questions and Answers/@comment-37159314-20190804125041/@comment-36009152-20190804230006

Good to raise, Yūichirō, Shihō, Sangū, Hīragi are a few examples of first and surnames that have diacritic marks above the vowels (fun fact of the day, the horizontal line is called a macron) to denote an accent of sorts.

Yes the English translation has them simplified, and since diacritical marks are largely not used in English, but the marks are help with pronunciation. Like rather than write Yuuichiro (pronounced "Yoo" not "Yu" like "huh"), Hiiragi (emphasis on the "i" not "hi" like "hiya" or "hi-ragi") and Sanguu like "goo", the accents are to specify the correct way of speaking the name, and is consistency if people cannot decide on the single and double letters.

Yes redundant in English, more so in anime where we can hear it, and an English translated manga that officially spells them with single letters, but in Japanese helps with the specifics. Rather than people thinking should we spell it "Yuichiro" or "Yuuichiro" since the Seraph of the End manga originated in Japan, it can pay homage to the Japanese spelling, and Yūichirō covers them both.

Still, comes between this is the English Seraph of the End Wiki so should copy the official English spelling, to we should use the marks to make sure people are aware of the pronunciation Japan style (all the more important with regional accents in universe, and from the readers view), and covers all possible spellings.