These ninjas will get Skillbreaks/Trials in future :

Kinkaku

Ginkaku

Kushina [Red-Hot blooded habanero]

Torune

Fu

Raikage - Ay

Mizukage - Mei

Danzo

Hanzo

Choza

Mifune

Tsuchikage - Oonoki

Pain - Gakido

Pain - Tendo

Pain - Ningendo

Pain - Chikushodo

Tobi

Konan

Yamato

Sai

Hidan

Kakuzu

Kakuzu [Earth-Grudge-fire]

Juugo

Karin

Edo - Deidara

Deidara

Sasori [Puppets]

Sasori

Baki

Shizune

Shino

Shikamaru [Child]

Shikamaru [Young]

Chuoji

Rock Lee

Sakura [Sailor] (after visual change)

Sasuke [Susanoo]

Sasuke [Western]

Naruto [Sage]

Hashirama [Sage]

Hashirama

Tobirama

Kisame

Itachi

Kimimaro

Hiruzen

Jirayia [Sage]

Orochimaru [Sannin]

Orochimaru [Traitor]

Kabuto

Guy

Zabuza [Swordsmen]

Temari [Swimsuit]

Gaara [Kazekage]

Hinata [Dreamworld] (After visual change)