A.C. has her problems, not the least of which is that fact she has no reservations about using lethal force if called for. Not exactly a comic code super. A 'Dr. Horrible' would either be subverted or outright killed if they proved to fill the 'archfoe' role. She does not need the agro.
I did have some plans for a nemesis for A.C. (and they are around in Fenspace), but I ended up realising a bit of A.C.'s history differently and have a more difficult time arranging things is such a fashion. That and the fact A.C.'s paying job is Handwavium Researcher, not Agent of S.H.I.E.L.D.
On a meta level a justifiable foe for A.C., that could not be effectively dealt with by her allies if not herself, would need to be discussed by the Collective, give the threat level they'd represent. It's one of the reasons I keep her back at the Forge most of the time.
I did have some plans for a nemesis for A.C. (and they are around in Fenspace), but I ended up realising a bit of A.C.'s history differently and have a more difficult time arranging things is such a fashion. That and the fact A.C.'s paying job is Handwavium Researcher, not Agent of S.H.I.E.L.D.
On a meta level a justifiable foe for A.C., that could not be effectively dealt with by her allies if not herself, would need to be discussed by the Collective, give the threat level they'd represent. It's one of the reasons I keep her back at the Forge most of the time.