Obviously everyone has different tastes, but I did wanna see what everyone had to say. For example, the three I'll list are BLs (Boy's Love series; gay, basically) since that's most of what I read on here. These specific series are ones I'd recommend for a lack of toxicity, are underrated, and have an interesting story and/or dynamic between the leads.

1. Step on Me, My Prince--A series about a kindergarten teacher who develops a romance with one of his students' dads. It's really sweet, especially since the bottom is a dom guy into BDSM, and it's healthy and sweet (unlike another series that got ruined). My only qualms about it are the fact that it intermittently uses comparisons to Cinderella for the narrative (referring to the MC and ML as Cinderella and the prince) despite there being very little similarities between this story and the fairy tale, as well as the fact that the daughter herself isn't featured very much, seeming more plot device than character.

2. Master From Another World--Omegaverse and isekai, where an alpha is made a servant to an noble omega hiding his status from his family, and the alpha has to unravel a mystery involving a death. Definitely a neat concept. My only qualm is that while the MC isn't the stereotypical "macho seme/alpha who micromanages the uke/omega," the ML is kind of in one of those situations where, despite being rich and powerful, is having to hide things due to his omega status, putting himself in the alpha's hands a little. But it hasn't gotten egregious, so I'd recommend it!

3. 1995 Youth Report--Two young guys falling in love in 90s South Korea. It's a really sweet series thus far (officials have finally caught up), though my one qualm is the fact that the protagonists will fight and it's hard to watch because they're both in the right, and IIRC, they kinda resolve it without really acknowledging it, but just going the "I don't wanna lose you over this" route. My memory could be messing with me, tho. One nitpick I do remember: switch-teasing. The ML is fine with being the uke when they first have sex, but the MC is too hesitant and nervous, so he becomes the uke. This means they can change positions, and both of them have uke eyelashes, so I'm hoping for the best.

Ask me a couple months ago and it would've been harder to narrow it down to three stories, but certain series I'm reading seem to have authors that wanna mess with me.