ok then, from your list
OPM
Hunter x Hunter
Deathnote
Attack on Titan
Full Metal Alchemist Brotherhood
Jujutsu Kaisen
Demon Slayer
Castlevania
Jujutsu Kaisen is the only one I have not watched.
Deathnote is the odd one out. If you liked that and if you are TOTALLY bored (i.e. hours to spare) try Monster (name of anime series about a serial killer). There is also a Manga of it, if you want to save time.
the rest are all quite similar, thus on that note I recommend (in order):
1. Go watch Vampire Hunter D: Bloodlust, the youtube links are above (japanese; english)
2. Ruroini Kenshin OVA Trust & Betrayal 1-4
watch the first 4 minutes. if you dont like that, (a) skip this OVA title and (b) you need clinical help. Haseo features at 3:05 in this OVA for 12 seconds. ^Haseo
https://twist.moe/a/rurouni-kenshin-meiji-kenkaku-romantan-tsuioku-hen/1and for fake fans (aka dubbed):
https://m.wcostream.com/samurai-x-trust-and-betrayal-episode-1-english-dubbedhttps://m.wcostream.com/samurai-x-trust-and-betrayal-episode-2-english-dubbedhttps://m.wcostream.com/samurai-x-trust-and-betrayal-episode-3-english-dubbedhttps://m.wcostream.com/samurai-x-trust-and-betrayal-episode-4-english-dubbeddont watch anything else under this title, its all bad.
3. Its old, but gold, the original Ninja Scroll (i could only find links to the "new" 2010 series (to be avoided!) not sure where to find the original!
finally as a seperate recommendation not based off your list, i recommend a short video and yes at 7:26 he is using Wissage):
https://www.youtube.com/watch?v=tYTc19rnw6o
i also recommend the original Ghost In The Shell, Stand Alone Complex Series 1 (at this point i am being lazy you can find it im sure). dont confuse it with all the other Ghost stuff out there (all bad!)
if you watch any of that, and like any of that feel free to come back for more.
feel free to also browse kissanime and
https://m.wcostream.com/ova-listlet us know what you think of the short video!
have you seen the 3 live action kenshin movies? #1 anime live action adaptations i've ever seen, best sword fight scenes of any movie i've ever seen aswell, and that's out of all movies. the picture is fucking phenomenal.
jw, kenshin my fav anime.