William Massachusetts

'''"Meetings are boring and useless. I want to walk my own path!"

- William, Volume 2 Annex '''

William Massachusetts, also known as Eyes of Mystery William, is the guild master of Silver Sword guild, whose specialty is ranged combat. As the guildmaster of a raid guild, William held that whatever happened to the city, for good or ill, was not his concern. In the wake of the formation of the  Round Table Alliance, and the good it brought to the city, he and his guild exiled themselves from Akihabara. While many in the adventurer population speculated that William was too proud to bow down to any kind of governing body, the truth was that his decision was brought on by a feeling of shame due to his own pettiness.

When he sees Shiroe's plan to improve Akihabara succeed and the people of the city finally happy, he deeply regrets his own petty decision not to take part in the Round Table Council and goes into self-exile.

When Shiroe ventures north to Susukino once more, William readily volunteers himself and his guild to aid in his latest scheme to make up for his previous lapse.

Personality
William dislikes joining meetings as he opposed his guild's joining into the Round Table Alliance, preferring to "walk his own path." However, he encourages the remaining 11 guilds to work on the current problem, proving that he's against joining the alliance but not against their principles.

Apocalyspe
William was seen rallying his guild right after the Apocalypse.

Resolve
William appears at the beginning of the episode as Shiroe explains how Guilds work. Silver Sword is mentioned by Maryelle as one of the guilds that was aiming to reach level 91 along with the Black Sword Knights.

Round Table Conference
William is one one of the guild masters who is invited to the Round Table Conference escorted by his elite bodyguards. However, he leaves shortly after the conference begins, because he feels that the situation in Akiba isn't something that his guild, which is a combat guild, should care about.

Even though he doesn't personally want to be involved in improving the conditions in Akiba, he encourages the remaining guilds to continue working on the problem in his absence. (He is against the Silver Sword's participation, not against the idea in principle.)

Libra Festival arc
William appears at the very end of episode 25, approaching Demikas after he and his guild traveled in self-exile from Akiba to Susukino.