X1 (エックスワン Ekkusu Wan) was the Top Assassin team of the Keron Army. The team consisted of six members, but only three have been named:
Jirara Shoutai

The group was mentioned for the first time in the anime, when Jirara challanged Dororo on Earth. In the present, it has been disbanded and Jirara is pursued as a criminal, although the reasons for the ending of the unit and Jirara's supposed crimes are known.

In a later manga chapter and anime episode, while meditating, Dororo remembered a conversation with Jirara, while other members of the Assassin unit stood far away from them.

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