some fictional ISTP leaders:

Tsurugi Momotaro the head of the first-year class of Otokojuku (Sakigake!! Otokojuku)

Mikoto Suoh - the Red King (K-Project)

Sorasaki Hina - President of Gehenna's Disciplinary committee and leader of Prefect Team

Bardock

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Guts - Captain of the Band of the Falcon's raiders (Berserk)

Bardock - The Leader of his own squad (Dragon Ball Z)

Charlotte Katakuri - Sweet Commander & Minister of Flour (One Piece) 

Charlotte Smoothie - Sweet Commander & Minister of Juice (One Piece) 

Yami Sukehiro - The Captain of the Black Bulls (Black Clover)

Mont Blanc Cricket - the leader of the Saruyama Alliance (One Piece)

Zeff - the head chef and owner of Baratie (One Piece)

Ashura Doji / Shutenmaru - The Leader of Mt.Atama Thieves (One Piece)

Vergo -  Marine vice admiral, and head of G-5 (One Piece)

Benimaru Shinmon - the captain of Special Fire Force Company 7 (Fire Force)

Stanley Snyder - military commander of American Colony (Dr.Stone)

Kaburagi - "Boss" of armor repairers team (Deca-Dence)