The most immediate example I cam think of is Bennett’s C6 from GenshinImpact, probably because I have been playing so much lately.
GenshinImpact is an openworld RPG game that has (at the time of this writing) about 36 playable characters. A major gimmick of the gameplay is that you can form teams of 4 characters and switch between them on the fly as needed (or team up with up to 3 other players and everyone gets 1–2 characters, depending on how many are co-op). Bennett’s gameplay is typically designated as a support character. His Elemental Burst (ultimate move) is called Fantastic Voyage and acts as both a heal and a buff to attack power.
This is a Constellation. As Genshin is a gacha game, each character is achieved randomly from the gacha system. In the event you get multiples of the same character, the first 6 extras will also give you a bonus called a Stella Fortuna that you can use to upgrade that character’s constellation. Each level gives the character some sort of buff, either giving them an extra quirk to their abilities or it is a simple power boost to one of them. The fandom calls these C levels for short, such as the first constellation being C1, second is C2, etc.
Bennett’s C6, his final power up, is Fire Ventures with Me. It gives everyone in range of his power boost a fire element and raises their damage output when using fire attacks. Sounds good, right?…
No. Several of the best characters have builds based around raising physical damage. Many pieces of equipment are also designed to raise physical damage. If Benny gives people the pyro infusion, they stop doing physical damage. This means what is supposed to be a power boost for other characters will instead result in their doing less damage than they would without his “help.” This is also weirdly on brand for Bennett, as his characterization in story is that he is extremely unlucky and a bit if a doom magnet. Annoyingly, the game also has no means of turning off a constellation if something like this happens, which means that if you activate it then you have “ruined” Bennett on your account, according to the game’s community. Which is awful, as he is otherwise considered the best character in the game… no, seriously. The status buff without the C6 is giving everyone in range an attack boost equal to 70% of Bennett’s attack stat. The same ability also passively heals everyone by a pretty huge percentage of his max HP per second until they hit at least 70% of their own hp. Basically, he keeps everyone alive by healing faster than almost any source of damage in the game (albeit not full health) while also giving a huge power boost to the party. As he only has a 4 star rarity (guaranteed to have at least one 4 star every ten pulls in the gacha) is included in the game’s permanent, non-event banner, is a frequent appearance as a rate up in event banners and has been available as a featured character in the in-game shop multiple times, pretty much everyone has at least one Bennett and raising his constellations is usually pretty easy and quick compared to most other characters. Fans unirinically refer to him as a 6 star character (which do not currently exist, as 5 stars is the highest rarity) and have often pointed out that any event banner with him attached are usually over powered compared to others. He isn’t even an example of power creep as usually seen in gacha games, having been available since the game released. As long as you don’t C6 him, he is a fixture on almost every game-meta team composition out there.