Juuou Mujin no Fafnir

This list is dedicated to such a specific sub-genre of LN as "action magic schools". Most of these stories are about how a talented and experienced OP MC ends up in a magic school where they train martial magic skills. Initially, most of the students treat him with contempt and disrespect, as the MC is erroneously defined as a weak loser. But thanks to his experience, intelligence and skills, he proves who is the big boss here. This LN is about OP characters, so almost every work is also an action harem.

Warning: Being one of the popular escapism genres, many works overuse very similar clichés and often take themselves too seriously. Also, most of the list includes large doses of ecchi, up to a separate sub-genre of "magic schools with erotic magic".
Warning 2: The list does not include the usual anime about magical schools like Blue Exorcist, since such works are representatives of the action shonen genre and are almost always published in manga form.

Being transfer students, the characters in these anime series have hidden powers that make them rather OP.

There are many anime stories with a transfer student character. The average anime title is about a transfer student who has to adapt to a new school. But it's not that simple, sometimes the transfer student character is also portrayed as an overpowered figure who was initially underestimated.

For the male fantasy of being the one boy in a world/school of all girls with sometimes one or two other random guys but mc is the one almost all the girls thirst over.

A list of anime containing ecchi elements, but are not tagged as ecchi by MAL. While the ecchi content may not be as prevalent or extreme as officially-tagged ecchi titles, there is still enough to be of interest to fans of the ecchi genre. Many of these register at least 1.5/3 stars on AniDB's "tag-weighting" system for ecchi.
Conversely, those who don't care for ecchi may wish to use this stack for cautionary purposes, as these titles may contain things like pantyshots, revealing outfits, incestuous overtones, oversized/jiggling breasts, swimsuit/lingerie moments, extended bath/shower scenes, lewd dream/fantasy sequences, innuendo, or general fanservice in an otherwise serious/"respectable" show.
Only the first seasons of franchises are listed. Some titles may (eventually) have additional details explaining why I've placed them on the list.

Part 1: https://myanimelist.net/stacks/24838
Part 3: https://myanimelist.net/stacks/26747

This list is still WIP...

Ah, yes. Dumpster fires. They smell terrible. They look terrible. However, people like me still can't take their eyes off of it. What makes them so addictive?

Trash comes in many forms. The good trash. The awful trash. The ugly trash. I'm trying to focus on the most entertaining dumpster fires. This makes it so that shows like Eromanga don't even end up on this list.

Anime that either has a lot of fanservice, or is classed as ecchi or erotica.

There's quite a lot of anime that have official collaberations with lolita fashion brands. Some of the outfits in the show itself aren't meant to be lolita, but they might still have a collab that is lolita irl.

Note I will try to link a search results page if there's multiple items in a collab, but if there's no way to get all items in a single search results page, then I will list only main pieces and blouses. I will also only list the original anime for all collabs (i.e. only the og rozen maiden and not any of the reboots or sequels, even if said collabs were made for those)

Some things unfortunately don't have a lolibrary listing, in which case I'll use other sources

and adjacent shows

all in the title really