The first known Mr. 7 was a round headed man with a number seven tattoo on his left cheek.
Virtually nothing is known about the late Mr. 7's personality, but he attempted to kill Zoro for refusing to join Baroque Works, showing a certain level of loyalty for the group.
Abilities and Powers
Mr. 7 was sent on behalf of Baroque Works to recruit Roronoa Zoro, who had gained fame as the "Pirate Hunter" in East Blue. Zoro retorted that he will join only if the organization takes him as the boss. Mr. 7 tried to use force against Zoro because of his refusal only to be killed by the superior swordsman.
Following Mr. 7's death, he was replaced by a new agent.