The TVTropes Trope Finder is where you can come to ask questions like "Do we have this one?" and "What's the trope about...?" Trying to rediscover a long lost show or other medium but need a little help? Head to Media Finder and try your luck there. Want to propose a new trope? You should be over at You Know, That Thing Where.
Try Informed Flaw and Compressed Vice, if those aren't it, the trope pages have plenty of links to similar tropes that might fit your situation better.
If not for this anchor I'd be dancing between the stars. At least I can try to write better vampire stories than Twilight.
Seconding Informed Flaw, in the "these flaws never seem to make their lives difficult" kind of way. Also, approaching it from the other end, the concept of "applying realistic consequences to a trope" is Deconstruction. To take your example, a fictional Tsundere is endearing in her mood swings, but a Deconstruction might notice that these mood swings are a red flag in a relationship and reveal her to be seriously messed up.
Is there a trope that addresses characters intended to be the love interest of the protagonist (and usually also the audience) that are given minor, easily forgiven flaws so they're kept out of Gary Stu/Mary Sue territory but objectively have nothing resembling any kind of serious flaws that would make it at all challenging to fall in love with them? In fact, these "flaws" are usually thinly-veiled positives.
To give some examples: -a female character who has a quick temper...but it's okay because she's cute and "spunky" when she's angry and she never does anything overly malicious due to anger anyway.
-a male character who's brooding and mysterious...but unraveling his enigma makes him enticing and there’s nothing truly dark or destructive behind his brooding nature in the first place.
In both cases, these are characters that are imitations of real flawed people with ACTUAL baggage, because their "flaws" will never be more than a "speedbump to romance", as they're so easily overlooked and have no lasting impact on themselves or the protagonist, with the "flaws" usually being fixed entirely by the end of the story arc (which just shows you how laughably unrealistic these kinds of characters are).
The girl with a quick temper will never trash the protagonist's apartment, destroying everything he owns, and forcing her to face the fact that she has serious anger issues. The brooding boy will never be revealed to have a deep, crippling fear of intimacy and human contact that will take years of therapy to treat.
Instead, these flaws will remain largely superficial and, worse yet, be entirely "fixable".
Is there anything this trope fits under? It's really not a Mary Sue/Gary Stu we're talking about here because that's usually the protagonist and they're known for having NO flaws.
Edited by El_Guapo