Ninjago

Arin's Battle Mech

A pocket-sized mech that gets a new Ninjago face into your hands fast.

Brick Rated Score

3.7/5

Set 71804 · 2024

Pieces104

Minifigs2

Year2024

Set number71804

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The verdict

I built this one on a lunch break, and that is basically the whole pitch.

It is a small, snappy mech for Arin, the mechanic kid who becomes a real fixture once Dragons Rising gets going, and it hands you a minifig you cannot get anywhere else in this scale for not much money. I will not pretend the build itself thrilled me. It is a straightforward legs, arms, cockpit assembly like a dozen Ninjago mechs before it. But as a cheap way into the new era of the theme, or a stocking stuffer for a kid who just started watching the show, it does its job without wasting your time.

Best for: New viewers of Ninjago: Dragons Rising who want an affordable first mech and the Arin minifig

The full review

What it is

This is a small one, and I mean that as a description, not a knock. Arin's Battle Mech is one of the entry level mech sets LEGO leans on to give every core Ninjago character a cheap, buildable ride, and Arin is the newer face here, the mechanic turned ninja who anchors a lot of the Dragons Rising storyline. If you or your kid has been watching the show and wants him in physical form, this is the easiest way in.

The catch

I will be straight with you about the build. It is legs, it is arms, it is a little cockpit that snaps the minifig in, and it goes together in well under an hour with no surprises along the way. There is nothing here for a builder chasing clever engineering or a rare new piece, and at 104 pieces there just is not room for it. The value is really in getting Arin himself, plus a small companion figure, rather than in the model.

Who it's for

Get this one if you want an inexpensive, fast build for a younger fan or you are filling out an Arin collection and do not want to pay for a bigger set just to get the minifig. Skip it if you already own one of the larger Dragons Rising vehicles with Arin included, or if you are a display builder who wants a mech substantial enough to hold its own on a shelf next to the bigger Ninjago sets.

The parts story

What the build is actually like, and the pieces worth knowing about.

Building this one is a fifteen to twenty five minute job, start to finish, and it reads exactly like what it is: a simple frame built around a click-in minifig cockpit, with legs and arms that peg on and swing through a small range of motion. There is no sub-build, no clever trick step, nothing that makes you sit back and go look at that. It is the kind of set you hand a seven or eight year old and let them finish on their own.

There is no hunt for rare molds or exclusive prints here, the parts list is mostly the standard bricks, plates, and Technic connectors LEGO reuses across the small Ninjago mech line. The real payoff is the Arin minifig with his specific printing and hair piece, since that is the only reason most collectors pick this one up rather than a generic small mech set.

Fun facts

01Arin is one of the new lead characters introduced for LEGO Ninjago: Dragons Rising, the rebooted CG series that relaunched the theme's storyline in 2024.
02Small mech sets like this one are a recurring format in Ninjago, LEGO builds one for nearly every core character so kids can collect an affordable version of each hero's ride.
03At 104 pieces this sits at the very entry level of the Ninjago lineup, priced to be an easy add-on or gift rather than a centerpiece set.