Aero

For what genre ?

Any as long as its good

Vinland Saga!

Okay here's some short great anime imo :
- a place further than universe (it might look silly n childish but give it a try its so funny but also heartbreaking)
- deca dence (might loose intrest after ep 2 or 3, but dont drop it its worth the stay)
- fire force is so cool n u can also check the manga
- tada kun wa koi wo shinai
- psychic detective yakumo (if u r able to turn a blind eye abt the annoying useless Female lead, u will be fine )
- sirius

the new side chapters of bj alex

There’s this little isekai trend about vengeful MCs that is perfect for your criteria! ٩(๑❛ᴗ❛๑)۶
http://www.mangago.me/read-manga/the_hero_who_seeks_revenge_shall_exterminate_with_darkness/
http://www.mangago.me/read-manga/tate_no_yuusha_no_nariagari/
http://www.mangago.me/read-manga/kaifuku_jutsushi_no_yarinaoshi/

These characters are so devoid of any personality that without them being trash, they would be nonexistent. It’s actually super hilarious!