|This article is about a/an mecha in Kaitou Sentai Lupinranger VS Keisatsu Sentai Patranger.|
- ―summoning announcement[src]
SirenStriker (サイレンストライカー Sairen Sutoraikā) is a specialized Trigger Machine modeled after an armored tank.
SirenStriker was housed inside VictoryStriker in a smaller form, but when it emerged, it returned to normal VS Vehicle size. Its default form can fire yellow explosive rounds from its giant cannon. Its Attack Mode unfolds plough-like extensions that can be used like a forklift to throw opponents. In addition, the missile launchers by the cannon's side activate.
When SirenStriker's Keisatsu Boost is activated onto a person, it grants them the "Super" armor based on SirenStriker itself (i.e. Lupin X transforms into Super Lupin X). By holding onto the shoulder handles, the shoulder cannons can fire laser blasts. By kneeling on one leg and charging up, a finisher is initiated. For Super Lupin X, it activates the Super Superior Strike, five golden steampunk-esque rockets. Another person can hold the handles for the finisher.
When Destra Majjo stole it for his final battle with the VS Sentai, SirenStriker granted him the ability to manipulate gravity. He used it until it was reclaimed by Patren 1gou with a distraction from Lupin Red.
During the fight over VictoryStriker, VIctoryStriker was under Jarnake Saucer's control. As the Lupinrangers were inside the Striker trying to figure out how to retake control of it, Lupin Red found out that another VS Vehicle was hidden inside VictoryStriker. SirenStriker then emerged from Victory's inner "hangar", and interrupts Jarnake's control. Later on Jarnake enlarges, so the Lupinrangers form Siren LupinKaiser and defeat him.
Appearances: Lupinranger VS Patranger Episode 38, 40-42, 44-48, 50-51, Kishiryu Sentai Ryusoulger VS Lupinranger VS Patranger
- "Complete! Siren LupinKaiser!"
- ―post-combination announcement[src]
Siren LupinKaiser (サイレンルパンカイザー Sairen RupanKaizā) is the combination of SirenStriker, Trigger Machine Splash, Magic Dial Fighter, and GoodStriker. This combination is very powerful because it can use all the cannons on SirenStriker and throw opponents back with the ploughs. SirenStriker seems to influence the other VS Vehicles in the combination, as it allows Splash to fire quick-drying cement. Magic can also enlarge the mace for a winding hit.
It finisher is Good Striker: Blow em to Smithereens Cannon (グッドストライカー 撃ち砕いちまえキャノン Guddo Sutoraikā Uchikudaichimae Kyanon), where Siren LupinKaiser blasts laser fire from Magic's baton, Splash's water cannon, and SirenStriker's cannons, missile launchers, & ploughs to destroy the enemy.
Appearances: Lupinranger VS Patranger Episode 38, 40-41, 45
Siren LupinKaiser Strong
Siren LupinKaiser Strong (サイレンルパンカイザーストロング Sairen Rupankaizā Sutorongu) is an illusion of LupinKaiser Magic, with Trigger Machines Crane and Drill replacing Trigger Machine Splash. It was used to test Dugon Manattee's knowledge on LupinKaiser, which he managed to identify this form being the fake as it has the wrong right arm. Afterwards all the forms of LupinKaiser vanished then the illusion reveals the real Siren LupinKaiser.
Appearances: Lupinranger VS Patranger Episode 40,
- "Complete! Siren PatKaiser!"
- ―post-combination announcement[src]
Siren PatKaiser (サイレンパトカイザー Sairen PatoKaizā) is the combination between SirenStriker, Trigger Machine Biker, Trigger Machine Crane, Trigger Machine Drill, and GoodStriker. This combination is extremely powerful than Siren LupinKaiser.
Its finisher is the PatKaiser: Siren Strike, where SirenStriker charges up with energy and fires at the enemy alongside Trigger Machine Biker's wheel and Trigger Machine Crane's crane arm, destroying the enemy. Its other finisher is the Patranger: Siren Gunner Strike (パトレンジャーサイレンガンナーストライク Patorenjā Sairen Gan'nā Sutoraiku), the Siren Strike done together with X Emperor Gunner's Gunner Strike.
Appearances: Lupinranger VS Patranger Episode 44, 46, 47, 50
- It is the second Trigger Machine to be used in a LupinKaiser formation, with the first one being Splash.
- Coincidentally, Siren LupinKaiser has Splash in its default formation along with the Magic Dial Fighter.
- In addition, it is also the second Trigger Machine to not have the numbering on the right side of the vehicle followed by  like Trigger Machine Splash and can be determined when turning the vehicles in Patrangers setting in the VS Changer. It is likely because this trigger machine was remodeled by Arsene Lupin instead of Noel.
- The SirenStriker is in line with the Patranger's symbol being the S.
- The treads on Siren Lupin/Pat Kaiser are similar in design to Yellow Blocker's chest armor.
- Just like DaiBouken Mixer from GoGo Sentai Boukenger, Siren LupinKaiser can encase an opponent in quick drying concrete.
- The way SirenStriker uses its forklift plow, coupled with its appearance, makes it appear similar to a stag beetle.
- Additionally, it bears a resemblance to the Gouraiger’s Mecha. As mentioned above, its appearance makes it similar to a stag beetle, just like the Gourai Stag while sharing the same motif of the Gourai Beetle (both mecha being tank-like).
- Interestingly, the SirenStriker has a color scheme (dark blue, red, and gold) that follows Keiichiro Asaka's police uniform.
- This plus the "Great Patrise!", "Chou Keisatsu Change!" and "Patranger!" sounds from the DX VS Changer suggest that it was originally intended to have Keiichiro as its main user instead of Noel considering that it is the Trigger Machine counterpart of VictoryStriker, which was mainly used by Lupin Red; however, Keiichiro finally used SirenStriker in the last episode, though for the only time.
- SirenStriker's robohead takes elements from a military battle mask.
- The "Chou Keisatsu Change!" and "Patranger!" sounds are muted when SirenStriker armor is used on Lupin X. However, both sounds are heard when it is used by Patren 1gou.
- In addition, the Patranger symbol located on the bottom of the piloting system is gone or left blank, even when used by the Patrangers.
- It is implied that Patren 1gou and Lupin X also gained gravity and force field powers while using SirenStriker. While Destra showcased this ability during his usage, it was never demonstrated by any VS Sentai Ranger.