Roronoa Pinzoro is a swordsman from a village in the East Blue, attested only via the family-tree diagram insert on SBS Volume 105 (Ch. 1062 p.132) — not Oda’s own written SBS prose. His name follows the same gambling-themed naming convention as other Roronoa/Shimotsuki relatives (“Pinzoro” = “snake eyes”).
Zoro — paternal grandfather, per the same diagram (hedged; the Gauntlet scores this specific chain refuted).
Catalogued from the One Piece Wiki and cross-referenced against SBS Volume 105. One-off / minor character — no on-page manga or anime appearance; depicted only as a named silhouette in the SBS diagram.