Ichigo Kurosaki from Bleach zigzags between this and Red Is Heroic. His spirit pressure in his normal Shinigami stage has a light blue color, as well as his Getsuga Tenshou technique. When he activates his Bankai, however, it turns black and red. However, when he activates his Final Getsuga Tenshou, it turns black and blue.
Played with in Naruto with Sasuke Uchiha. Before the Time Skip, he was usually associated with blue due to his costume. However, after his Face-Heel Turn, he drops that color almost completely. Even when he gets his most powerful attacks, his Chakra turns purple..
Seiya from Saint Seiya, whose Cosmos and attacks all glow in this color. The Pegasus armor usually gets a blue hue as well, which is specially prominent in the manga. The anime tends to go for a Primary-Color Champion by mixing with some red clothes under the armor and some yellow ornaments.
Death Note has L as a Hero Antagonist version of this trope. L is usually associated with the blue color, while Light Yagami is associated with red (Usually by portraying them with unnatural lighting of said colors).
Saber, from the Fate/stay night franchise. She wears a blue Battle Ballgown. The Visual Novel also usually depict her attacks with blue Sword Lines (as seen in the trope image). The ufotable anime adaptation of Fate/Zero, as well as the upcoming remake of the original Stay Night, also feature that. (The exception would be the Excalibur attack, which power is symbolized by a golden light.)
Shinji Ikari, the main protagonist from Neon Genesis Evangelion, whose pilot suit is blue in contrast with the other pilots (white for Rei, red for Asuka, black for Kaworu and pink for Mari).
As part of his Primary-Color Champion status, Superman's suit is prominently blue. Specially after the New52, where he dropped the red underwear. Although the big red cape is just as prominent, the blue suit conveys more Superman's gentle and kind nature.
Captain America. Albeit his costume is supposed to represent the American flag, blue is by far the most prominent color. This helps to drive home his straight leadership in The Avengers.
The Fantastic Four. Full stop. All four of them wear iconic blue skin-tight jump suits.
Nightwing's traditional costume uses a prominent blue trim, symbolizing his more level-headed attitude in comparison to Batman.
Cyclops, the team leader of the X-Men, is usually depicted in a blue spandex in more modern versions. Another iconic example in the same series would be the Beast, with his blue fur, which matches his intelligence and kind nature.
Batman sometimes has a blue batsuit (especially the cape and cowl) in some iterations. He tends to be more... stable, when he's depicted in that one (albeit not always).
Dr. Manhattan, from Watchmen, is a pretty unique tragic, borderline Anti-Hero example.
Despite his name, Black Lightning's costume sports a dark blue costume with prominent bright blue trims.
A-Bomb, Rick Jones's mutated form, resembles the Hulk villain Abomination with the exception of being colored blue. Though he resembles the Abomination, A-Bomb is more heroic than his green colored villainous counterpart and is an ally of Hulk.
Probably the most iconic example in the medium is the blue lightsaber from the Star Wars series, usually associated with the Jedi, in contrast with red lightsabers for the Sith. With the exception of Return of the Jedi, when green was used instead due to technical difficultiesnote Namely, Lucas intended to make Luke's new lightsaber blue like the last one, and it can be seen as such in one trailer. However, they changed it to green because they couldn't make the color to stand out over the sky in the scene where it first appears., the main heroes have always used a blue one more often than not.
Played with in the prequel trilogy with the the laser beams from the Clone army, and during the Anakin Vs Obi-Wan duel. Considering how blue is used prominently as the color of good in this series, this helps to establish the morally messed-up situation of the Clone Wars. Especially in the duel.
The Master of Disguise subverts this, as it's actually the villainous Devlin Bowman whose surroundings are often lit with blue lighting, and he wears blue shirts under his white suits. Word of God was that this was a stylistic choice to have seens with Bowman feel cold and menacing (as opposed to the Disguiseys' world which had lots of warmer colors like red and gold).
Played with in Wreckit Ralph. Fix-it Felix Jr., the AdorkableNice Guy is dressed all in blue, in opposition to Ralph's red. In the "Fix-It Felix" game, they're The Hero and the Big Bad respectively. However, the story of the movie itself is about Ralph trying to move away from his role as a villain and trying to become a hero of his own. Felix, on the other hand, moves to a Lancer role, but without loosing any of his heroic traits.
Mega Man being a damn close second. He is also known as the "Blue Bomber" because of the color of his body, i.e mostly blue. Same goes through his other incarnations in the Sequel Series. Notably, they always tend to be innocent or noble-minded in contrast to other characters, although it never stops them from getting stronger.
The Alliance campaign of Warcraft III gives you blue-armored units (unlike Warcraft II and Starcraft, there are no faction-specific colors).
Raynor's Raiders in the Starcraft games are blue-armored (in the first one, you sometimes play as the red Sons of Korhal, but go back to blue once you leave them after their Face-Heel Turn).
The Fire Emblem series. With a couple of exceptions, the main protagonist is always depicted with a distinguishable blue hair, with blue clothes to boot.
The main hero from Persona3 is associated with dark blue.
Kasumi, main heroine of the Dead or Alive franchise. Her most iconic outfit is a blue kimono.
Albeit he's associated mostly with green, Link from the The Legend of Zelda series usually gets blue as a prominent secondary color by the Master Sword, which hilt is purplish-blue, and all his forms of Sword Lines, Sword Beam and such, light blue. Also, the Hylian Shield.
Sparkster, the main protagonist of the Rocket Knight Adventures series, has a light blue armor which is put in contrast with his Evil Counterpart, Axel Gear, who wears a suit of dark purple armor (Red in the 2010 game, Rocket Knight), as well as the green armor of Emperor Devligus Devotindos' Pig Soldiers in the original game, and the purple armor of King Gedol's Lizard soldiers in the Genesis sequel, Sparkster: Rocket Knight Adventures 2.
Shulk from Xenoblade Chronicles, by the blue Laser Blade of the Monado (both the original and the replica) and, specially, the intense blue glow of his eyes each time he has a vision of the future. This eye glow eventually evolves into a full-fledged blue Battle Aura.
In Highborn, the Highborn army and buildings they control are blue. It's even Lampshaded by some of the characters, who occasionally say something to the effect of "Oh, he's blue, so he's on the Highborn side". When you play as the Decay in the third chapter, they become blue and the enemy Highborn become red instead.
Also, both here and in its Sequel SeriesThe Legend of Korra, where the Avatar enters the Avatar State, their eyes glow light-blue. It was explained in Book 2: Spirits that this is the manifestation of Raava, the Spirit of Light, who is this color in opposition of Vaatu, the Spirit of Darkness, who is dark red.
Five hats means that five tropers think it is ready to publish.
You are saying that you think this draft is ready to be published. That means the description is not ambiguous,
it doesn't duplicate an existing trope, there are at least three examples, and the title makes sense.
Is that what you meant to do?
You are saying this draft has a ready-to-publish hat it does not deserve and you are taking it back.