Sarutobi is a  ninja and a member of the Beasts Pirates. He previously was a member of the  Orochi Oniwabanshu which served the shogun of Wano Country, Kurozumi Orochi.
Sarutobi without his mask at age 25.
Sarutobi is a very large man with tanned skin and a long, wild mane of light hair. He wears a purple gorilla-like mask over its face with round red eyes and horns at the top. He wears a blue kimono which is open at the front, showing part of his chest covered in netting; he also wears a red obi and a yellow scarf.
As a member of the Oniwabanshu, Sarutobi appeared to be loyal to
Kurozumi Orochi until the latter's supposed death. He easily believed  Brook to be an evil spirit and so became very scared upon being confronted by the pirate's disembodied soul, believing it was the Gashadokuro.
Abilities and Powers
Like the other Oniwabanshu, Sarutobi possesses tremendous stealth abilities and was able to sneak up on
Nico Robin with the entirety of his group. His specialty is "Illusion"  (. 幻術 Genjutsu ) ?
Wano Country Arc
Nico Robin was sneaking around Orochi Castle, Sarutobi and the rest of the Orochi Oniwabanshu silently appeared behind her. The group moved to restrain her, but then discovered that this Robin was actually a  body double, and so Fukurokuju sent them to the banquet hall to locate the real Robin.  Daikoku eventually spotted Robin and the Oniwabanshu confronted her, but she and her accomplices were able to escape.
Brook scares Sarutobi and other members of the Orochi Oniwabanshu.
Shimotsuki Yasuie's execution, the Orochi Oniwabanshu arrived to help fight off the Straw Hat Pirates. However, Sarutobi, Chome, and Bishamon were quickly scared away by Brook's disembodied spirit, which they mistook for the Gashadokuro.
Several days later, the
Fire Festival arrived and the Oniwabanshu accompanied Kurozumi Orochi to Onigashima to celebrate with the Beasts Pirates. However,  Kaidou seemingly killed Orochi during the festivities as part of his plot to assume full control over Wano, and Fukurokuju pledged the Oniwabanshu's allegiance to the Emperor and his crew.
Sarutobi is likely named after
Sarutobi Sasuke, a popular fictional ninja in Japanese folklore. His appearance fits his name, which contains the kanji "Saru"
(, meaning monkey. 猿 ) ? Sarutobi's favorite food is hardy kiwis. 
: Devil Fruit Based • Artificial Devil Fruit • Fuku Fuku no Mi • Fude Fude no Mi ( Ryunosuke † • Kazenbo) • SMILE • Zou Zou no Mi, Model: Mammoth • Kibi Kibi no Mi • Inu Inu no Mi, Model: Tanuki • Wara Wara no Mi • Uo Uo no Mi, Model: Seiryu • Juku Juku no Mi • Maki Maki no Mi • Ryu Ryu no Mi, Model: Allosaurus • Ryu Ryu no Mi, Model: Spinosaurus • Ryu Ryu no Mi, Model: Pteranodon • Hito Hito no Mi, Model: Onyudo • Ryu Ryu no Mi, Model: Brachiosaurus • Oto Oto no Mi • Ryu Ryu no Mi, Model: Pachycephalosaurus • Ryu Ryu no Mi, Model: Triceratops • Kumo Kumo no Mi, Model: Rosamygale Grauvogeli • Neko Neko no Mi, Model: Saber Tiger • Hebi Hebi no Mi, Model: Yamata no Orochi • Inu Inu no Mi, Model: Okuchi no Makami • Toki Toki no Mi † • Mane Mane no Mi † • Bari Bari no Mi †
Tori Tori no Mi, Model: Nue ≠
: Fighting Style Based • Haki ( Ryuo) • Oden Two Sword Style • Foxfire Style • Ninjutsu
: Weapons • Shusui • Kitetsu ( Shodai Kitetsu ? • Nidai Kitetsu • Sandai Kitetsu ‡) • Sukesan and Kakusan • Tsuji Shibai • Soto Muso • Hassaikai • Takeru • Ame no Habakiri • Karakuri Rasento
: All-Stars • King • Queen
: Tobiroppo • X Drake ‡ • Page One • Ulti • Who's-Who • Black Maria
: Shinuchi • Sheepshead ? • Ginrummy ? • Basil Hawkins • Holed'em • Speed ‡ • Dobon • Babanuki ‡ • Daifugo ‡ • Solitaire • Bao Huang • Briscola ‡ • Fourtricks ‡ • Hamlet ‡ • Mizerka ‡
: Gifters • Batman • Gazelleman ‡ • Mouseman • Snakeman • Rabbitman • Sarahebi • Alpacaman • Madilloman • Dachoman • Tenjo-Sagari • Nure-Onna • Caimanlady • Wanyudo • Armored Division ‡ • Trio the Grip ≠ • Bearman ≠ • Llamaman ≠
: Waiters • Massui • Pudos • Ibiributsu • Donannoyo • Uwattsura
: Numbers • Inbi • Fuga • Zanki • Jaki • Goki • Rokki • Nangi • Hatcha • Kunyun
: Samurai • Fukurokuju ‡ • Daikoku • Raijin • Fujin • Hanzo • Chome • Jigoku Benten • Bishamon • Yazaemon • Kazekage • Sarutobi
: Other Members • Scotch ? • Scratchmen Apoo • Hihimaru ‡ • Kamijiro
Subordinate Crews: • Drake Pirates * • On Air Pirates
Allies and Affiliates: • Big Mom Pirates • Yamato ‡ • Kurozumi Family ( Kurozumi Orochi) ‡ • Donquixote Pirates ( Donquixote Doflamingo • Caesar Clown) ‡
Bounties Pirates ≠
Ships: • Mammoth † • Liberal Hind ‡ • Stay Tune
: Devil Fruit Based • Uo Uo no Mi, Model: Seiryu • Ryu Ryu no Mi, Model: Pteranodon • Ryu Ryu no Mi, Model: Brachiosaurus • Zou Zou no Mi, Model: Mammoth • Ryu Ryu no Mi, Model: Allosaurus ‡ • Ryu Ryu no Mi, Model: Spinosaurus • Ryu Ryu no Mi, Model: Pachycephalosaurus • Ryu Ryu no Mi, Model: Triceratops • Kumo Kumo no Mi, Model: Rosamygale Grauvogeli • Neko Neko no Mi, Model: Saber Tiger • Inu Inu no Mi, Model: Okuchi no Makami ‡ • Wara Wara no Mi • Oto Oto no Mi
: Fighting Style Based • Haki • Shuron Hakke • Rokushiki • Alpaca Kenpo
Weapons Based: • Hassaikai • Karakuri Sword • Karakuri Rasento
Support Based: • Koro • Seastone • Excite Bullets ( Mummy • Ice Oni)