-I absolutely adore the "idiot with a golden heart" trope for some reason a lot. I love when the characters seem to be shallow or idiot on the outside and they are regarded as that, but they are in fact the group's heart and soul. They are the one who will fight fiercely for their friend if there is injustice or would sacrifice their own reputation for them. This can be done really badly though if the character is reduced into a butt-monkey and doesn't get the sweet character development.
-"Soft giants" has to be one of my absolutely favorite too! The big ones (no need to even be a buff) who look a little scary or either unapproachable but are in the end the softest and the most emotionally vulnerable ones. My heart dies when they do some cute gesture and get embarrassed when they are caught doing it!
-When the character tries to be no-approachable and are either cocky, cold or smug but, in the end, are the most awkward and biggest dork in the group. This is my absolute favorite if their cool and cocky attitude is often played for laughs AND if they get character development.
Basically the trope of "someone is opposite of what they seem to be" gets me always. These are my favorite variations of it. However, if I have to be unnecessarily specific, then a trope of:
-A main character who happens to be an idiot with a golden heart and they aren't naive. They would also have a crisis in life but, through other characters, they realize that they've brightened others' lives. My unadultered wish full-fillment