In Asterix, this is explicitly stated multiple times to be the reason why the Gaulish villagers keep Dreadful Musician Cacofonix around at all, despite him being a pretentious, delusional nuisance otherwise. Once you get past how Giftedly Bad he is and his complete inability to recognise it, he's shown to be among the most caring, thoughtful and reasonable of the townspeople, although that isn't reallysaying much.
Many of the heroes from Astro City would fall under this trope, but the Trope Codifier in the verse is The Gentleman, who's completely and unflappably polite, no matter how dire the situation — after rescuing a news helicopter that endangered itself by flying into a battle against a storm elemental, he simply smiled to the crew and politely suggested that they might want to get to safety and not endanger any of the bystanders on the streets below.
Paulie in Circles is one of the nicest and sweetest people you could ever meet. He is always friendly towards everyone and even his "enemies" like his cranky and homophobic neighbor when Paulie used his money to pay for his neighbor's back injuries. Eventually his neighbor warmed up to Paulie's friends and accepted them openly.
Rarest of rare in Monstress's world, but there is one: Rezak. He risks his life to save an Arcanic child, is friends with a high-up Cumaea member, and when Maika is pushed into him by a Cumaea after being bought, his first instinct is to hug her. Whether he'll remain nice in this Crapsack World remains to be seen, but he's doing a pretty good job of it so far.
Scott Pilgrim from Scott Pilgrim is ultimately one. Scott is by no means perfect, being The Slacker, a bit slow and does not think things through resulting in him sometimes inadvertably hurting those close him. However, he is pretty amiable, is the least hostile out of his group of friends, and Ramona did call him the nicest guy she dated (granted, everyone except perhaps Lucas Lee were jerks of varying degrees.) Scott's friends tend to veer more toward Jerk with a Heart of Gold.
Mighty the Armadillo from Sonic the Hedgehog (Archie Comics). Unlike most beings on Mobius, Mighty is so damn strong that nothing really poses a threat to him. Mighty uses this strength to benefit those that are weaker, including his less-brave friend Ray the Squirrel and his long-lost sister Matilda. The only time that Mighty loses it is when he perceives harm as having come to his friends.
Inanna of The Wicked + The Divine. Luci states that his tiny mean streak is still just a dash on a marble of pure loveliness. When the audience finally meets him, he more than lives up to the hype.
Dionysus is as well. His only goal is to use what little time he has left to live to help others feel alive.
