There are actually a bunch... Most of the teams in the top of PvP are using characters that have an AI which actually works better in combination with other characters. Many of the mid to upper level Eddies have decent AIs.

Don't get me wrong, I'm not saying Lucifer is a "weak" or "bad" character in ANY way. I'm merely pointing out that the AI for Lucifer isn't as good as it is for some other characters and he's new, so the AI for other characters doesn't react in a way that helps him survive longer or push his abilities more.

If you auto farm dungeons you can get a clue as to how a character's Ai operates. Put Lucifer on a team and run him through a PvE dungeon a few times (with an Ed that has a fury) and you'll see he RARELY uses his power move or Fury. Compare this with a character like the Corrupt General.. he'll use his power move and fury WAY too often.

I have zero clue how what move from what character and what time is factored or determined. However, patterns start to develop.

Now, of course, if Lucifer is paired with an Ed that has no fury, he'll use the fury more often. But from what I have seen thus far in PvP.. that's generally not enough since permadeath and perfect death are rather prevalent and other than blocking all damage and reviving allies.. there isn't much "punch" there. But again, he's new so it may take more exploration into talisman setups and ally configurations. i.e. Killer Prime without warlords+healing is a good character.. but put warlord+healing talismans on him and he's a monster.

Dark Lilith is kind of in the same boat.. except, due a bug it seems, she can add perfect disable and silver buffs to Charlotte.. which she should NOT be able to do. This, to me, actually makes Dark Lilith a tad better than Lucifer. Especially since when fully awakened she prevents enemies from reviving. But unfortunately Dark Lilith doesn't have the resilience that Lucifer does (once fully awakened).