This Character is extremely skilled in a fight, often applying brains over brawn in order to win with little effort. However, when pushed too hard he may collapse in a coughing fit, or pass out post-battle. He may find it hard to train, as he has to take it easy, but his talent allows him to keep up with other characters.
This may be caused by a weak immune system and frequent sicknesses that sap his strength, a single disease such as consumption or epilepsy, or just being born with a weak body (such as a malformed heart).
A common occurrence would be for this character to be ambushed because of his weak appearance, then fight off his attackers, only to collapse after the fight has ended
- Captain Ukitake from Bleach. Even though he's one of the most powerful Soul Reapers, his illness seems to prevent him from fighting for very long, and he appears to lapse into coughing fits at inopportune moments.
- Kurogane Hiroto in Kurogane (not the one on this wiki). Because of his weak body Hiroto was always the worst at sports. But when he takes up kendo his excellent eyesight allows him to avoid being hit by his opponents. At one point he faints because he's unused to the weight on the kendo armor. Waiting to see if he can strengthen his body or not.
- Kimimaro from Naruto. He's dying from an incurable disease which should have left him unable to move let alone fight, yet has no problem taking on a Kyuubi-empowered Naruto, Lee, and Gaara. The only reason he fails to deliver a death blow to the latter two is that his body simply gave out mid-strike.
- Also applies to Itachi, who contracted the Incurable Cough of Death at some point after leaving Konoha. He sought medical treatment, so that he'd meet up with Sasuke again, in hopes that the latter would kill him in battle. While Itachi did die in a battle with Sasuke, it was from overexertion, not the direct result of anything Sasuke did.
- Kashitarou in Gamaran. So weak he can't swing a full katana, he uses a wakazashi instead and focuses on extreme control of his movements, in particular eliminating wasted movements.
- Papillion from Busou Renkin, an alchemist who successfully creates several homonculi before upgrading himself in hopes of curing his Incurable Cough of Death and giving him superpowers. The getting superpowers part worked, but he was still physically frail and coughing.
- Izumi from Fullmetal Alchemist, despite her insistence to the contrary, is a powerful alchemist and all-around badass who famously survived for a month in the frozen wastes of Briggs by raiding the military outpost there for supplies. However, she lost several of her internal organs to the Portal of Truth when she attempted human transmutation in order to resurrect her baby; she's still no less badass than before, but tends to break down coughing up blood if she exerts herself for too long. In the first anime, she dies in between the end of the series and The Movie; in the second series and the manga, Ed and Al's father Hohenheim gives her an "alchemy punch" of sorts that cannot restore her lost organs, but does stop the bleeding more or less permanently.
- Elric of Melnibone is physically frail and weak, requiring him to depend on either herbal medicine or his Life Energy draining sword Stormbringer for the strength necessary to fight. However, when he has the strength he's an excellent fighter.
- Jem from The Infernal Devices series. He's addicted to a drug that kills him slowly but the withdrawal will kill him if he doesn't take it. So he takes as little as possible, but as the drug also gives him energy this causes him to appear very frail. Yet he is more than capable of fending for himself against the demons he frequently encounters.
- The Dragonlance series of books has Raistlin, at least when he's human in the earlier books. Ridiculously powerful mage from a very early age, but also sickly and prone to coughing up blood.
- Subverted in The Breaker, while Shi Woon originally had such bad ki circulation that he couldn't exercise without fainting the Applied Phlebotinum fixed his health issues.