Bruhs and Lady bruhs, and ultra bruhs, allow me to give you some guidance here:
The Obvious Best Horrors:
1. Boku no Pico
2. Record of Ragnarok Netflix Adaptation
3. That CG season of Berserk
4. Whatever Studio Perriot did to tokyo ghoul
5. Anything where a grown man is trying to seduce a child
6. Ghost Stories but the English dub
I've got more lists. You want more lists? I've got them.
Other Interesting Horrors
1. That one episode of Overlord
2. Higurashi... admittedly, it's also pretty funny
3. Cells at Work (The human body is scary)
4. Mushishi
5. Parasyte
6. Made in Abyss
7. Madoka
8. Grimgar of fantasy and ash
9. Psycho Pass First Season
Still need some lists? Bruh, I've got them
My personal preferences for Highschool anime. There's probably more, but these are the ones in my head right now
1. Highschool DxD
2. A Certain Magical Index
3. Hero Academia
4. When Supernatural Battles Became Commonplace
5. Misfit of Demon King Academy
6. Amagi SS
7. Gundam Witch of Mercury
8. Terror in Resonance
ManwX's like of Beelzebub actually tells us a lot. Considering Beelzebub as the standard, maybe we can fill in some others. The unfortunate thing is that Beelzebub's style doesn't make the transition over to anime well, because those mangas don't typically do well enough to get adaptations.
So, ManwX, this is me trying to match a few to you
1. When Supernatural Battles Became Commonplace (It might be different enough)
2. Kiznaiver (Very divisive, but it has themes about emotions)
3. Gridman SS (An 'ok' blend of highschool, kaiju, and character)
3.5 Kill la Kill (I don't think this will work, but putting it in because of how many trigger series are here)
4. Little Witch Academia (Cute, but not complex and sometimes irritating.)
5. Shokugeki no Soma (Might as well add it)
6. Terror in Resonance (it's different than most highschool ones)
7. Katekyo Hitman Reborn
8. Bakuman