Since Marlo is also part death it could be interesting how they can play that with Hulk being immortal. Also of course Marlo being resurrected after being killed by Rick's "mom" was partially the work of Soul Man who was brought up in the Leader issue. So it would kind of fit in well.
Also her current feelings for Rick perhaps? Of course that might be difficult considering he's currently possessed by the leader and also mutated into a weird gamma creature again it seems.