The Fact That Karkat Got So Conflicted And Emotional Over Eridan Killing Kanaya That He Doesn't Even Know If He Should Hate Eridan- - Tumblr Posts
the way that karkat has never once had to do the "are we still friends" thing with eridan because eridan literally cant shut up about how funny he thinks karkat is and how much he wants to hang out with him, even when karkat is yelling genuine death threats at him
& the way karkat has a major problem with seeing past/future versions of people as separate entities, but outright calls past, future, and current eridan "the same [eridan]" because he subconsciously considers eridan a constant
& the way that eridan implies that karkat making death threats to him is what their regular banter looks like, meaning karkat - despite being a cull-on-sight mutant, and eridan being a murderous genocidal sea dweller - has always felt safe enough around eridan to threaten him with bodily harm