I discovered SSSS on TV Tropes, where after seeing examples from the comic on multiple pages in a short time, I became curious. Initially, I didn't have any intention of actually reading the comic itself, as post-apocalyptic media typically sets off my anxiety very badly.
As you can see, things worked out differently than I planned. I followed the link to the Tv Tropes page and was suckered in mainly by its description of Lalli. Specifically, I was charmed by his catlike behavior and (implied, plausible, arguable, whatever words I have to use to appease the canon-compliance dusklings) Asperger's syndrome, both of these being traits I share, and intrigued by his being from Finland, a country that my uneducated American arse had had no concept of outside of "that is the name of a country that exists" until a few months prior, when I had found myself in a class with a really cool professor who had moved to the area from Finland.
(I've referenced Cool Finnish Professor in the comments a few times. She's great. When there was the discussion over Lalli saying "Over...there...ish" when there is no equivilant to "ish" in Finnish, I showed her the panel and asked for her input on what he would be likely to say, which led to me telling her about SSSS and her actually being interested and saying she would have to look it up. I wonder if she did.)