All these anime's include very shippable characters who mostly have no other person in the anime you could possibly ship them with. This is a marketing ploy because this makes anime/ships very popular as well as being apart of the lgbtqia+ community is not openly embraced by any Asian media. A lot of these anime's has novels, manga chps, side manga, official art, and drama cds that are very suggestive or downright very gay. They have all have very suggestive scenes in the animes as well including op, ed, end credits that are very fruity.
disclaimer: Includes anime with non-canon couples, non canon lgbt but all animes are gay coded in a way that queer people recognize. Also most have anime with canon lgbtqia+ characters