If we go full serious in regards to making this then power null is an obvious. Having straight power increase would be ridiculous.
Maybe it would be an on loss/win dice on one of her cards like Carmen. Maybe it would be some other mechanic.
As for X not being that strong as a character. I mean, Carmen is literally a toothpick who died to getting her wrist cut. And shes literally the hardest fight in the game.
Angela got no fighting experience either and she got more HP and stagger per Realization when compared to Kali. Sure you can say that its the abnormalities doing her work for her.
Roland isnt giving the abnormalities he synchronize with any more buffs, when compared to Angela.
The light steroid doesnt really care how strong you are in life. Only what Abnormality you resonated/synchromozed with.
If it was just straight Reception as she is right now, all she would be is a 700 HP and 240 Stagger (I dunno about exact numbers but she should be lower than Kali's, since they have the same Red Mist Prime body while not having the experience to not get staggered as hard) boss with a variety of cards regarding abnormalities.
As for army in pink being similar to Philip's minion, I would like to say no on this.
I would say its better to compare them as an emotion oriented Rabbit goon instead of charge, over comparing them to Philip's goons. Especially since Philip's goons debuff you while Army in Pink is just there to shoot you.
As for the MGs outperforming X...not likely. Unlike what you think, X literally had a whole side chapter where she displayed her capabilities in wielding multiple abnormalities at once with basically no limits.
And since the EGO guide her on how to use them, she should be atleast as capable as a group of agents with the same amount of ego, except being way tankier than them and having a higher fire rate.
Aka, I dont think anyone but Homura and Mami can contend with X just due to the fact that shes so versatile and also being strong on top of that.
Especially since X can spam her attacks without worries (unless she tries to increase her firepower beyond her limits) while Mami and Homura are strictly limited by their grief pool.
If its in term of the game, Mami has around 4 speed dices. X have atleast 4 alongside the 2 for each soldiers.
Shes not weak. We are literally just having her run around playing guardian instead of going head first into battle so she doesnt get a chance to display it.
Edit:
Saying that, comparing Homura, who can time stop by the way, to X is unfair. I dont think that theres literally anyone who can beat Homura.
Atleast until X get an Abnormality that revolves around time anyway.
Hell, I might even go as far to say that even Gebura/Kali would struggle to deal with Homura even with abnormality pages and EGO pages. Like seriously, she can stop time.