Haikyuu: Yutaro Kindaichi had a grudge against Tobio Kageyama in Kitagawa Daichi Middle School due to the latter's bad manners, mocking him as "king of the court" and at one point refusing to hit his sets anymore. Years later, when Kageyama attempts to apologize, he immediately cuts off and says he'll never view him as anything but an enemy. Nobody in the series, not Kunimi, not Iwaizumi, not Oikawa, not Hinata, not even Kageyama himself, calls him immature or petty. Kageyama continues his quiet part of self-improvement, and while Kindaichi does warm up later, it's only because Kageyama himself has changed beyond hateable.
Notably, Haikyuu doesn't have a villain, and Kindaichi isn't even a "jerk" character; he's a genuinely sweet and sensitive person who's allowed to hold grudges without him becoming a Shogo Haizaki.
Attack on Titan: during their attempt to stop the Rumbling, Annie Leonhart, one of Marley's Warriors, has a farewell with the Survey Corps. Annie was responsible for attacking Paradis on Marley's behalf and the deaths of several beloved soldiers, and had shown pretty much no remorse due to trauma. While Armin, Hange, Connie, and Mikasa have forgiven her and bid her a warm farewell, Jean Kirstein shows no warmth, still not forgetting Marco Bot's death. This happened after Jean had already ignored Annie once and beaten Reiner senseless in a campfire before. Jean also didn't warm up to Magath, still holding Marley's colonialism responsible for Eren's madness till the very bitter end.
Jean is, in the end, still very much an anti-Rumbling hero, not a barbarian like Floch, so "grudge corrupts" doesn't apply to him narratively like it applies to the Yeagerists.
Both of these archetypes stand out from Frankenstein's monster, Dabi, or Sasuke Uchiha, whose grudge narratively hurts others. Both of them also stand out from the Todorokis, who try to see the best in Endeavor while claiming they'd never forgive (Kindaichi does forgive eventually, but Kageyama by then has changed way more than Endeavor ever did).