These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Anticlimax Boss: Juno, the Final Boss from the first game, big time. You can literally run around in circles shooting and dodging all of his attacks easily, and this was even worse if you used the fully charged Active Buster in the fight.
Demonic Spiders: Sharukurusus, the humanoid Reaverbots, in both games - they run fast, hit hard, and can leap to avoid shots. They also appear in packs, so you may be blasting away at one and fail to hear the clanking footsteps until its friend impales you. And in the first game, there's even an invisible version that only reveals itself when it's just about to impale you.
Firushudot— the crocodile-shaped Reaverbots from the Lake Jyun Gate— are exclusive to one corridor in the first game, but they carry long-range sonic beam tech and are horrendously powerful even against beefed-up armor and firepower. And, again, they tend to pop out of the walls in groups. Your best bet is to either walk slowly or run like hell.
From the second game, Shoebafun. Only found in two levels in the second game, but easily the most paranoia-inducing reaverbots. They arefloormasters that pop out at random and eat you alive, and the only way to escape them is either jumping at exactly the moment you see one coming up or through some serious button mashing once it's got you.
Ear Worm: The Servbot/Kobun Training Theme in Misadventures.
Ensemble Darkhorse: The Bonne Family Pirates, especially the Servbots. To wit: they got an entire Gaiden Game starring them (namely Tron and her cadre of Servbots) and Tron and the Servbots made the cut twice for the Marvel vs. Capcom series, first in 2 where Tron and a Servbot are playable, and then in 3, the Kattelox Island stage features Teisel, Tron, and a lot of Servbots. Heck, Tron was announced as playable for Marvel Vs Capcom 3 before any other Mega Man character, and, along with Zero, another fellow Ensemble Darkhorse, they are the only representatives in the game.
Tron and the Servbots (along with X and Zero) are set to appear in Project X Zone. Tron has now officially made more appearances (outside of cameos) than Volnutt has.
Fridge Brilliance: Why do you go to Data to save your game? Because he holds your memory.
Game Breaker: The drill arm's near-zero range and inability to use while moving make it highly impractical to use as an offensive weapon, so most players will only use it for its wall-breaking utility. However, it has the highest attack power of any weapon in the game, and infinite energy. So if you come up on a enemy/boss that doesn't move around very much, you can do stuff like this.
Also the Active Buster in the first game, especially when it was fully powered up. It took a lot of money to do so, but once you did, the rest of the game was a piece of cake.
Genius Bonus: The Gesellschaft and Gemeinschaft are sociology terms. Gesellschaft can be summed up as "rich and socially isolated from family" and Gemeinschaft can be "poor but a close family." The former is a large airship and the latter is a comparatively tiny rail-car, both owned by the Bonnes and reflect their current financial status (though "close family" here can mean that they are physically crammed close together).
Good Bad Bugs: In the second game. There is a bug where holding down the fire button and pressing forward quickly and repeatedly allowed you to rapid-fire the buster regardless of its Rapid stat. This is very useful for the S Class Digger Test.
Or what Data says at the end of Legends 2...Might take a while, indeed.
Internet Backdraft: Mega Man Legends 3 was recently canceled. Within mere minutes, the announcing blogpost was filled to the brim with angry fans. Many of them swearing to never buy a Capcom product, again.
Worth noting that not only did Capcom give the fans false hope (at least according to the fans; they did hype the game up quite a bit, plus encouraged fan participation in its construction), they didn't really explain why it was canceled (just that it "didn't meet criteria"). Plus, that Prototype version that was meant to test sales? Also canned, despite being completely finished.
One of the first casualties resulting from the backdraft was Capcom's livestreaming of Ultimate Marvel vs. Capcom 3 the day before the San Diego Comic Con. The stream's chat was instantly flooded with people chanting "LEGENDS 3! LEGENDS 3!" to the point that Capcom had to shut down the broadcast due to the spam.
In Name Only: Much like with the Mega Man Battle Network and Mega Man Star Force series, it could be very easily argued that this series has little, if anything, to do with any of the other series in the main timeline in both gameplay and story. Mega Man X7, regardless quality, could be seen as a more faithful transition to 3D than the Legends games.
Launcher of a Thousand Ships: Mega Man Volnutt. He is coupled with any girl in the Legends series. Yes, he is even coupled with the supporting and minor female characters.
Magnificent Bastard: Teisel has shades of this. The Bonne's are utterly devoted to him, and many, many times in Misadventures of Tron Bonne, the Servbots talk about how inspiring and charismatic he is. While he's prone to becoming angry when something gives him trouble, when he is defeated he tends to either become relatively quiet (when Mega Man defeats the Marlwolf), accept it with surprising grace (when Megs defeats the Focke Wolf), or smoothly improvise a way to salvage victory from defeat (after Mega beats Bruno) by not only convincing Mega Man to not turn the Bonnes in, but also noting to Tron that since Mega Man is such a good digger, he will eventually find the Mother Lode, and when he does, they can take it first. Cementing Teisel as this trope: This plan goes off without the slightest hitch..
Teisel Bonne, who whenever he has to fight against Mega Man he is bound to lose however given simply fighting against a highly advanced precursor combat android in the Legends games. In the other games he gets captured early to the point that some parts of the Fandom think of him like this while forgetting that besides doing all the raiding schemes before Bon Bonne and Tron came into scene.
Memetic Mutation: Not as prominent as some memes, but there's a joke among fans of the series that Mega Man underwent "reverse puberty" between games 1 and 2, due to a change in voice actors making him suddenly sound younger.
Nightmare Fuel: Pretty much all the ruins in the first game, as well as all the Bonne's strongest robots (Tron's giant spider robot, the Feldynaught is a standout example). The second game's ruins are pretty scary too, although special mention goes to the Saul Kada Ruins.
This article would be remiss if it did not mention thismusic:
That horrible buzzing sound your alarm makes when Reaverbots are nearby is guaranteed to make you jump. Every single time. Thankfully, it was removed in the sequel.
The Old City in the first game is a more mundane example. It's a sector of Kattelox that's mostly abandoned. Unlike the rest of the island, it's bleak, gray, and dirty. There's no music whatsoever, and the streets are completely empty...aside from the packs of feral dogs that are ready to rip all intruders to shreds.
Ship-to-Ship Combat: The fanbase is split almost directly down the middle on whether Megs should be with Roll or Tron.
And lord knows what he's been up to with Yuna and Sera in the real time following the ending of Legends 2. Suffice to say that some of the Ship To Ship Combat in the fandom revolves not around which girl Mega Man should take, but whether or not he should take all of them.
Strawman Hasa Point: There's a scene in Manda Island in Legends 2 where Tron is trying to break Mega Man's trust in Roll by telling him she overcharges him for weapons and effectively steals money from him. This isn't presumably supposed to be anything but Tron making stuff up, but in Vprisoner's LP he points out how much the accusation resonates due to how ridiculously expensive it is to fully upgrade several weapons in both games, with it requiring an elephantine amount of grinding.
Surprisingly Improved Sequel: The first was in no way bad, but it's amazing how much a simple thing like being able to move while locked on to a target can improve an experience.
That One Boss: Yakuto Krabbe, Tron's crab-like machine in Legends 2. And considering it's one of the earliest bosses where you will have little in terms of upgraded weaponry, it's a hell of a Wake-Up Call Boss.
That One Level: The Nino Ruins in 2, which isn't suprising considering it's a Down the Drain area and has all of its trappings: most of it has you moving veeeeery sloooooowly through water (which also messes with your jumping physics, making it harder to dodge enemies), is labyrinthine and very, verylong, and it's packed to the brim with some of the more tedious and/or annoying Reaverbots in the game. At least it's got some good music for you to listen to. By extension the Kimotama Caverns fall into this category as well, just without the cool music (you instead get the Clozer Woods ruin music from the first game, which is more Nightmare Fuel / Hell Is That Noise than anything).