I got the second season Battle Pass (I had earned enough Gleamium from earlier that I didn't have to buy more in order to afford it), so I have Jack now, and I got Superman with character shards. (which means that I have all of the characters that I wanted to buy - the DC characters aside from Black Adam, plus Jason. At this point, anything else is an added bonus)
Jack seems kind of basic to play as, but I'm enjoying him, and the new gems seem like they'll be fun to use with him. (or with some other characters who have charge attacks)
Samurai Jack and Beetlejuice also fall into "series in this game that I haven't watched", though I feel like I've got enough shows on my plate at the moment. (I'm trying to catch up to modern Doctor Who, I bought Star Trek: The Original Series on DVD, and I still haven't finished Breaking Bad)
Also, I'm glad to see that the Prestige Currency items (like the Batman Who Laughs costume) don't disappear from the store at the end of the season, and that the currency carries over. (I was worried that both would be wiped away at the end of the season and that people would have to start fresh)