Just wondering, when did you all start watching the show and how did you find out about it?
For me it was around about August 2015, after the realise of "Friend Ship" but before "Nightmare Hospital" (back when everyone thought the Hand Cluster was the Cluster Peridot mentioned in "Jail Break"). Although my story has more detail and actually happened after getting into Adventure Time.
(If your not interested into how I got into AT, skip the next three paragraphs)
I've always wanted to create my own series one day. Since 2013, I've been creating character for a potential series (if you want to know more about my ideas please ask in my message wall, so as to not to go off-topic). I showed my sketch book to everyone I know and they all like it. One of my sisters (I have three), who has sons young enough to watch Cartoon Network by default, asked me if I wanted to do something like Adventure Time or Regular Show, and even suggested I watch them for inspiration. And so I did.
I heard people in my class talking about how good AT was, and I read about the game "Explore the Dungeon because I don't know" in my Official Nintendo Magazine, so I knew it had a huge adult fanbase, so I wouldn't be embarrassed watching a "kids show". At first I thought it was going to be like Narnia, Princess Bubblegum being Ooos equivalent to Alsan creating the land, and I thought Finn was going to be a boy from the real world who somehow ends up in this magical land.
So I watched an episode of AT and RS on T.V. to see if I'll like it (the AT episode I watched was "You Made Me" btw). And then I decided to binge watch every episode of AT from beginning to the latest episode. I tried to binge watch Regular Show as well, but I eventually got fed up.
(Now for Steven Universe, finally)
So, I was into Adventure Time, and I stared exploring the wiki. (note, my only internet access was my Wii U and collage computer, so I couldn't join the wikia until 2017 when I got my laptop) I saw links to the Steven Universe Wiki and would joke to my self "Sounds like some kind of rock band". But then in 2015 I saw this advert [[1]]. Steven Universe only appeared for like a few seconds, but still it looked kind of funny. So I decided to explore the Steven Universe wiki to find out if it was worth watching (giving myself tones of spoilers in the process), I especially liked Lapis and Peridot (ironic if you remember that this is before they started living together), although I'll admit I originally only like Lapis for her design, but seeing the show gave be a deeper reason for liking her. Peridot I liked mainly because she reminded me of a character I created for my series (if I ever find a way to make it).
So after this I decided to watch the show myself from beginning to the latest episode, and I loved it. It was a bit slow to start with, and I'll admit I watched "Jail Break earlier then I was supposed to, since at the time that was the best episode and, along with "Mirror Gem" was the one that starts he story proper. I'll admit I didn't like Pearl as a character at first, although I loved her design, but she eventually grew on me.
And since then I've been a Steven Universe fan, and when I eventually git a laptop I joined the wiki.
So that's my story, sorry it was long. If you have any questions please ask and I hope to here your stories of how you became a SU fan on this thread