- Topple locks. With enough skill levels and gems to extend Topple's duration, the cooldowns for Topple arts will finish before the effects even wear off, allowing the party to keep up an infinite chain of spamming Topple on enemies so that they never even get a chance to get up. It's possible to defeat enemies far above the party's level by cheesing it, as seen here.
- Specific game-breaking characters are:
- Shulk: His regular arts are easy to score criticals with if he's under player control. This builds up the Party Gauge rapidly, allowing you to use Chain Attacks very consistently. He even packs a little healing to go with it. And that's not even counting the Monado on top of all that, which on a New Game+ with the Infinity +1 Sword version, has a 75 percent critical hit rate and by far the highest damage of any weapon. His talent arts with it can allow him to deal heavy damage, seal enemy auras, and defend against their arts, making Shulk the most versatile character in the game.
- Dunban: Is just behind Shulk for the strongest regular attack in the game, and his agility lets him tank just as well as Reyn without needing quite as much healing while almost guaranteeing continuous damage against enemies. He also starts off with the ability to inflict Break -> Topple all by himself, and his multiple auras allow him to multitask as needed. Dunban's massive agility also lets him consistently hit enemies with a massively higher level than his own which makes him a vital part of most strategies for defeating the optional Superbosses.
- Melia: Discharging her spells counts as a neutral art during Chain Attacks, letting her serve as an "adapter" between two characters with otherwise-incompatible arts, making it very easy to get the maximum 5x damage multiplier. She also has a very useful instant-Topple art combo with Spear Break + Starlight Kick. Even though her AI doesn't utilize her to her full potential (and tends to have her get WAY too close to enemies despite her being the least durable character in the game), in the hands of a player, she's probably the hardest consistent hitter in the game and her spell discharges can result in a barrage of lethal damage-over-time ether attacks on top of it.
- Seven/Fiora: Once you've fully unlocked her fourth skill branch, all of her counter-attacks and double-attacks become critical hits. By borrowing Dunban's Critical Drain ability, she can heal herself with practically every hit. In addition, her Sword Drones Talent Art can rack up huge amounts of damage with a full chain multiplier (to the point where it's capable of killing the strongest Bonus Boss in one Chain Attack).
- Using an enemy in Tephra Cave to damage boost past a certain ledge note allows you to get into a level 90 area to walk around, and since just discovering stuff gives you XP proportionate to the area's level, this results in instantly boosting the party to around level 50, making at least the early game a complete joke. As a bonus, you can also get level 5 and potentially 6 ether crystals, allowing you to craft gems you normally shouldn't be able to get until the endgame.
- Using Melia's sleep and spear break commands, it's possible to push Gogols off the cliff side on Bionis leg, killing them instantly and dropping a chest. While the characters will only get EXP directly proportional to their level regardless to keep from power grinding, the Gogols still drop some pretty good stuff such as great late game equipment, max level art books, and near max level strength up gems that can reach max with some diligent crafting. All this helps save a lot on money and gem space, as you won't need to buy equipment for that piece of armor ever again or even need more than one strength up gem to reach the maximum boost it can give you, and any repeated art books you get can be sold for high amounts of cash.
- Completing nearly every sidequest as quickly as possible as soon as they open up. In order to encourage players to seek out side quests, completing sidequest usually gives you far more EXP than you would from fighting monsters normally. This wouldn't be too game breaking in itself if not for the sheer amount of sidequests the game throws at you every time you reach a new area, and several of them being incredibly easy/quick to complete. Ultimately, going for 100% Completion usually results in characters being horrendously over leveled in comparison to what the game expects of you; often with them ~10 levels higher in relation to the enemies in the area, up to including the Final Boss. Money is also a complete non-issue because of this as well.
Game Breaker / Xenoblade