Surprisingly cute Mecha!

Huh, that's a cool fun fact! Maybe Go Kirama Red could've been the 4th G Red, but his actor is too famous.

Nah, numero 4 is technically Geki Red, 5th being Go-On Red, 6th is Gosei Red, and 7th is Gokai Red.

Is 119 the Japanese equivalent of 911, or is there some other wordplay / context I'm missing?

Yea, that's exactly it. 119 is the Japanese equivalent of 911.

But those guys have nothing to do with lions or firetrucks.

My bad, I thought you meant the G Reds proper. :lolol
Just remembered Kiramai Red drove a fire engine.

Wonder how to picture a BoonBoomger & King-Ohger crossover in the near future?

• Bun Red & Kuwagata Ohger: ?
• Bun Blue & Tombo Ohger: ?
• Bun Pink - Kamakiri Ohger: ?
• Bun Black - Hachi Ohger: ?
• Bun Orange - Papillon Ohger: ?
• Bun Violet + Spider Kumonos: ?

The 4th quarter mecha is going to be a train.

I'd wager that a new enemy in the King-Ohger side of the plot pulls them and itself into the Highway Dimension via wormhole shenanigans. Bun Violet, understandably not expecting, almost runs the King-Ohgers over, and just barely swerves enough to only knock the monster away, presuming it dead, with our main evidence to the contrary in this scene being the lack of an explosion. Meanwhile, the main five Boonboomgers are fighting a Grumer whose gimmick is swapping places with others in their immediate vicinity, causing them to land hits on each other and/or pull their punches at the wrong time. They meet back up with Bun Violet, meeting the King-Ohgers in the process. The king-Ohgers are sent to deal with the Grumer while the Boonboomgers finish up some work based on data they got analyzing the King-Ohgers' changer weapons. The swapping gimmick is considerably less effective against a team that has shields for nearly all of their members, so the King-Ohgers are winning right up until a suspicious wormhole opens up behind one of them, and a mishap with the Grumer's swapping gimmick results in both of the 2 monsters exclusive to this crossover fusing together into something it takes both teams working together to defeat.