I have been thinking about this but there are definitely some characters that I have actually grown to like not because I read their ongoing series but because they frequently appear in other series or events that I read. I mean there are a lot of characters in the DC universe but I can’t hope to afford to read them all but I still know who some of the characters are because they pop up. I’m sure other readers have the same experience so I thought I’d ask.
For me I’ve been thinking about Swamp Thing, I have not read any Swamp Thing ongoing series or digital exclusives but I like him because he constantly appears in events I read like Metal or Death Metal or ongoings like Superman or as a member of Justice League Dark. It also helps that he was playable in the Injustice 2 video game. I might pick up some omnibuses of his in the future but as of right now I can’t say I’ve sought out anything specifically Swamp Thing related.