CSdev Bug report: Megalomaniac Forsaken cannot be set to training plan None once they are assigned a training plan. You can view this in the first save in the attached file saves.sav--go to Torment the Third and try to clear her training plan.
I suspect that the game is treating all selections on the first page as increasing Corruption, which disables them all for Megalomaniacs.
Also, does strengthening the Megalomaniac distortion do anything? It's noted in game but if it does anything that's opaque on my end.
Updated 5/4 with another believed bug: I believe that Splendor's Glorious Fatal Curse is bugged and not triggering correctly. Even when HATE was her only circumstance over 1000 and both her allies were surrounded for 8 turns, she only did standard moves like Distract, Blast, Rally, etc. Use the attached BuggedSplendor save, load slot one, and send out Hatepsha (1000% HATE) to check for yourself.
Update 5/4 with probably unintended interaction: Animalistic Chosen will still use Frenzy even after a Devil has knocked the Forsaken out of the fight. As Chosen generally are strategic with their use of Tier 3 breaks, this seemed out-of-character enough to notice.
Update 5/4 with new bug report: Splendor's Bargain will in certain unknown circumstances cause the game to hang. It is possible that this only happens when there are no Chosen in a Loop (as is the case in Alternative Routes), but it does not always occur in this circumstance. I have a save file that reproduces the error--load save 1 in BuggedBargain, find Splendor on Page 3, and choose Bargain to reliably freeze the game.
General feedback: I like the new Megalomaniac Forsaken/Chosen a lot. Currently on Loop 10. The tradeoff of having to get their Corruption stats up manually is a good one. You are probably aware that the combination of "must consent to training" and "can't autoimprove Corruption" means that some stats will be impossible to raise for some Forsaken, but this is fine--built in, even, I would say, since if you don't like your Second, you can always get another one.
One thematic thing that I noticed was that a Forsaken with I think the Shy personality was still being kind of indifferent/reserved with her Favorite text, even though she was Megalomaniacal and currently my Second. When you do another flavor pass, these would be good places to add specific Distortion-based interactions.
I'm going to start Loop 11 when I come back to the game, which may or may not be this weekend, and I'll try to give feedback on loops 11-15's difficulty with Splendor defeated in loop 10 next time. The first 10 loops are pretty rote by this point so I have no additional balancing feedback. It was rather easy to beat Splendor using Megalomania (distorted around day 8 or so) but then her fight was never really intended to be the challenging part of her.