Kamen Rider Senshi: Ninja Form

UPDATE: Redesigned Senshi.

Gender: Male
Series: Kamen Rider Build
Motif:
- Warrior
- Mechanical
Rider Type: Neutral, Anti-Hero
Status: Active ("Ghost")
Affiliation: Touto, Team Link, Mitsukage Clan

Quote
- "Kamen Rider Senshi has arrived!" - Pre-battle catchphrase.
(仮面ライダー戦士、見参！, Kamen Raidā Senshi, kenzan!)

Character Info
Tsurugi Amano (天野 剣城 Amano Tsurugi) was part of the Mitsukage Clan, a group of warriors hailing from Touto, led by Kaito. On one hand, he is a trustworthy warrior who helped Link to take down Faust, but on the other hand, he is a serious spy with hatred and anger due to his past with Tomb Plague. He uses the Build Driver and Senshi Gear, stolen from Link's lab, to transforms into Kamen Rider Senshi (仮面ライダー戦士 Kamen Rider Senshi, Masked Rider Warrior)

Alias
- "Purple Assassin" (紫の暗殺者 Murasaki no Asashin) - by Shokyo and Kojaku.
- "Shimaru" (紫丸 Shimaru, lit. Purple Circle) - by Mitsukage Clan members.

Relationships
Team Link
- Shokyo/KR Link: More info later.
- Kojaku/KR Con-Net: More info later.
- Kaito/KR Liftoff: Kaito is Tsurugi's master.
- Karasuma/KR Plague: Tsurugi doesn't trust Karasuma, but he getting used to it.
- Kamen Rider Jaw-Z: Jaw-Z and Tsurugi fought each other in the tournament and became rivals.
- Konomi/Morpho Witch: Neutral
Others
- Dirus/KR Dire: Dirus is Team Link's main enemy.
- Rikuto/KR Great Plague: More info later.

Description
Ninja Form is Senshi’s default purple form is accessed using the Ninja Fullbottle, by inserting it into the Senshi Gear after it has been inserted into the Build Driver and turning the Vortex Crank.

History
More info later.

Forms
Standard Forms
- Ninja Form
- Kaizoku Form
- Knight Form
- Samurai Form
Super Form
- Senshi Storm
Final Form
- Senshi Typhoon

Henshin
"Ninja! Warrior Gear! (Standby loop, followed by cranking the lever) Are you ready? Shadow of the night! Shinobi Warrior! Yeah!"

Equipments
Devices
- Build Driver: Transformation Belt.
- Senshi Gear: Slot adapter for Build Driver.
- Fullbottles: Transformation trinkets.
  - Ninja Fullbottle: Used by Build to Best Match with Comic and access NinninComic Form. Also used by Senshi to access his main form using the Senshi Gear.
Weapons
- Gear Slasher: Senshi’s main personal weapon.
- 4Koma Ninpogatana: Senshi’s copied personal weapon.

Powers & Abilities
In this form, Senshi increased kicking and punching power with the cost of jumping power and speed. 
Bunshin no Jutsu!
Senshi creates a number of clones of himself.
Katon no Jutsu! Kaen Giri!
Senshi delivers a flaming slash attack.
Futon no Jutsu! Tatsumaki Giri!
Senshi creates a tornado and spins.
Kakuremi no Jutsu! Doron!
Senshi creates a cloud of smoke to escape.

Finisher
Senshi cranks the lever to perform the finisher.
Ready, go! Shinobi Finish!
He attacks an enemy with a purple energy slash rapidly. Then he creates large purple shuriken energy and throws it to an enemy.

Notes
- Like Cross-Z, Senshi’s suit is modified from Kamen Rider Build's Half Body.

!- NO STEALING! -!