My first anime (i.e. “cartoon”) in childhood times is probably Pokemon or Digimon.

Excluding those, it should be The Familiar of Zero or Infinite Stratos. I simply watched whatever my friends were watching / recommended back in my school days.

But the first anime in recent times - the one that kickstarted my 700+ anime journey? It’s Gundam: The Witch from Mercury.

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First anime that I downloaded and watched on computer was Mirai Nikki circa 2014. I YOLO watched the full series from 21h to 7h next morning.
Totally wasted at the end, like being drunk without alcohol.

Somehow I found doing this funny and redid it (less harcore) a few times with other animes.

I’m semi convinced that I saw some part on TV before, not really sure.

I watched a lot growing up, probably my first one ever was Sailor Moon or My Neighbour Totoro when I was around 5, then as I aged my anime choices slowly evolved (and I was also limited to what was on the TV until around 2003/2004 and started watching streams on whatever site I could find. My first ones that I guess I thought of differently than as an after school cartoon would’ve been Escaflowne in 2002 and Inuyasha in 2003.

Evangelion. One might imagine that it was a bit of a wake up call that anime ain’t kids cartoons, and I then became a self-respecting anime watcher until the Age of No Time arrived and I just rewatch Toradora! Or Clannad so I can sweat manly tears.

Gonna feel old here but:

“Voltron: Defender of the Universe”

Probably Neon Genesis Evangelion… I watched several others before this because they looked good…I watched NGE because it’s an institution, apparently. Not my favorite, but I could understand the memes after watching it.

Dragon ball, because they streamed it on the open channels on the tv. After that it was Naruto, Pokemon, Hunter vs Hunter and One piece

YuYu Hakusho, Dragonball Z, and Gundam Wing were airing around the same time when I watched them.

Urotsukidoji, after seeing it on laserdisk at the first ever Hellraiser rave party (Netherlands). I was mesmerized more by that giant screen than the actual rave, so I looked for it, which back then was very very difficult. People didn’t know what anime was and I didn’t even know that word anime. I was lucky enough to have the Videoland (video rental place) help me out because after me telling him what I had seen, he was interested. First I actually managed to get Akira, and watched that, then eventually I found Urotsukidoji, which back then was imported via a label called “Manga entertainment” and dubbed, from great britain. Later on I would also find (very expensive) Manga dubbed tapes in the brand new Virgin megastore in Amsterdam. And thats how I got started with anime, this was in 1992. Been in to anime ever since, first thinking it was actually called manga, but then learning about it. even joined a mailing list fanclub (there was no internet yet, just BBS’s which were dial-in) where I learned a lot about it over the phone from the guy running that mailing list. they would send out a news letter it was a lot of fun reading those.

It’s one of those 3:

• Heidi, Girl of the Alps
• Maya the Bee
• Captain Future

I don’t remember which one of those was actually the first (most likely Heidi or Maya, just going by the kid-friendliness), but all three are in my earliest core childhood memories.

Furthest back that I can remember are Doraemon both films and series from around 80s 90s and some other tokusatsu. All on VHS. Can not remember which one exactly is “the first”. I start early ;)

Then some series that I never watched from start to finish on cable network. Like Ranma, Sailor Moon, Oh! My Goddess, You’re Under Arrest!, Houshin Engi, El Hazard, CC Sakura, Galaxy Angel. I always try to be in time for Sakura and Galaxy Angel airing, because cute girls. Never did, because school.

edit to include Utena… it became a source of running joke between me and a girl next door.

Some certainty with title that marks the moment I start actively seeking out and watching more anime. Probably Sister Princess, fan-subbed, burned on CD-R. Good times.

Beyond the usual Dragon Ball and Pokemon things, along with catching random episodes of Sailor Moon, Hamtaro, Cardcaptor Sakura etc on morning TV before school, It was Evangelion, Bebop and couple of years later FLCL on late night TV. I also remember seeing a few random episodes of Escaflowne as well in the 90’s.

I later completely watched and got very into Eva and Cowboy Bepop, but i still didn’t really think of it as Anime for some reason.

so beyond those the first “modern” anime that I watched and actually got into the media properly with was Haruhi, then the first thing I watched in Japanese instead of English was Hibike! Euphonium.

so that’s where I stopped watching dubs for shows other than the classic dub series where most people also listen dubbed.

The first anime that I watched that I thought of as an anime was Cromartie High School. My college roommate called me over to his desk and in the end we watched the whole show on his monitor with me looking over his shoulder. I really enjoyed it, but I didn’t think too much about it and didn’t watch another anime until I saw Fullmetal Alchemist Brotherhood about 4 years later. It was all downhill from there.

I am not 100% sure but it most likely was “The Promised Neverland”.

Of course if I wanted to count the ones I watched as a kid, then one of the Ghibli studio ones would be it, I guess “Howl’s Moving Castle” or “Totoro”?