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Notes that apply to all my fanfics:

Wall Breaking:
First Wall Break; When a character acknowledges that they are currently engaged or involved in a literary/plot device.
Example: Matthius, “We’re nearing the conclusion.”.
Second Wall Break; When a character acknowledges that they have seen similar circumstance, plot, or situation in other media/works. A reference.
(1) The media/work in question must be a fictional work not related to old myths, legends and tales. So referencing the works of Da Vinci would not really be breaking the Second Wall. But referencing the Harry Potter series from J.K.Rowling would.
Example: Sanae, “Giant Mechs? This is just like the Gundam anime!”.
Third Wall Break; When a character acknowledges that they are really just a part of some sort of plot driven story.
(1) They don’t know (for certain) that all their actions and thoughts are the result of a ‘Writer’. And thus are still under the illusion that they have some sort of free will and self-determination, attributing all inevitabilities to ‘Fate’.
(2) Often confused for a Fourth Wall Break by everyone. Especially the people who write them.
See also; [Toby Fox]’s works. In particular, the Undertale Fandom’s posterboy Sans. He knows that he is part of a game but is still believes that his ‘choice’ to fight the Player in the Genocide Route was really his own decision, or nondecision; “Something that had to be done.”.
Example: Jaune, “It doesn’t matter if you’re immortal, Salem; I’m the main character, so I’m obviously going to win.”.
Fourth Wall Break; When a character acknowledges the audience, reader, or ‘Player’. The Fourth Wall literally refers to the imaginary wall separating the characters from you in theatre. As such, it may be referred to as a ‘Dissimulated Glass Wall’; the characters may be aware of it, but ignore for some reason unique to the work.
(1) They don’t have to interact with the audience/reader/Player, but that is the most common occurrence in a Fourth Wall Break, especially in live performances such as plays.
(2) They don’t realise the implications of such a situation. Often regarding the audience/reader/Player as an observer—or perhaps mistaking them for another character—within their own world; or the ‘next world over’ in a multiverse/archverse situation.
(3) It’s also a trope to have only one, or a small minority of characters capable of breaking Fourth Wall; with the reaction of other characters on-scene being the comedic effect.
Example (1): Yukari, “Why don’t we ask our dear friend over there what they think?” (Often whilst gesturing or notioning in some way to the ‘camera’, though in literary works, it will say something along the lines of “staring past into the distance, into your soul.”).
Example (2): “Look, I didn’t want to be a half-blood.
If you’re reading this because you think you might be one, my advice is: close this book right now. Believe whatever lie your mom or dad told you about your birth, and try to lead a normal life.” -Percy Jackson in the opening page of Percy Jackson and the Lightning Thief. Aware that it is a story, whilst at the same time saying that the reader may be a ‘half-blood’–a concept in the Percy Jackson series; Thus believing you to be a part of ‘his world’.
Fifth Wall Break (The ‘Roof’); When a character refers to other works that are connected to their own. Sometimes noting that they seem to have multiple experiences or perhaps conflicting memories. The ‘Roof’ can be a metonym analogy to how opening a room to look at the sky expands the ‘world’; especially in works which feature a ‘multiverse’ or some other archverse.
(1) They may talk about other works created by the same person or people. There are three different ways to pull this off; a) An embedded narrative. Where a character describes the events of another work. (Not to be confused with an intercalated narrative; where it branches of midway into several smaller stories Like omakes or OVA). b) Where the character refers to a counterpart in another work. Or c) In a crossover, when both parties are in total awareness that they are from different verses/stories.
(2) Where a set of events/works take place in the same timeline, a character could make an off handed comment about the bibliography. Things that have happened, will happen, should have happened, or never even happened in the first place. They may even note that there is a gap in memories or some sort between the previous piece’s ending and the current piece’s beginning. They could even go as far as to saying that certain events happened out of order, or at least it felt like they had.
Example (1): Astrum!Matthius, “That’s just Matthius from the Cycles series, wonder what he'd be doing here.”.
Example (2): Marisa, “Mae no shō demo nita yōna koto o itta to omoimasu~daze. {I think you said something similar in the last chapter~ze.}”.
Sixth Wall Break (The ‘Floor’); When a character paradoxically acknowledges that, yes, their very actions and thoughts and the things around them are the mere whim of a ‘higher being’ completely unrelated to any sort of religion. At this point, the character may be seen becoming more or less emotional than normal. Perhaps adapting new quirks and speech patterns, all to show that they have stopped becoming consistent; their perception of ‘self’ and ‘reality’ begins to blur and fade away until you are left with an apathetic husk. The ‘Floor’ can be a metonym analogy to how destroying the foundation of a building will cause all the things inside to collapse.
Beyond the Sixth Wall (The ‘void’); Refers to various Quantum-esque Mechanics that may also deconstruct the world of the Writer (our world) to be as inconsequential as the one the Writer has created. After all, if their world has been nothing but words on a page, or some other kind of entertainment, then what’s to say we aren’t the same. If other beings that may or may not even be humans are looking at us, imagining how we behave, think and act. What if, just as we may be simple sentences put together to be imagined into a form–even they were merely words on a page too?
*Imagine writing about a story about a person who writes a story about a person who writes a story about a person who writes a story about a person who writes-… It just keeps going on and on; infinite multi-transversal dimensional layering.