[quote=@FatPrincess]
[@Cu Chulainn] Hey! So I really LOVE the choice you made. I think it is very creative and I've never seen him app'd before! Unfortunately, Kirei would exist in the universe, though he'd have no part in the roleplay. Changing the picture would probably be for the best, just to avoid confusion. I have to admit before I read anything I was [b]SO[/b] scared I was about to read someone submitting him as a servant...

The only thing that concerns me is the double plus modifiers when his NP is activated, which I do understand to an extent, and considering that is his only Noble Phantasm, I think it should be fine. Just know that this roleplay won't take numbers TOO TOO seriously. They are more so a guide to tell us how good the servant is at something, an explanation for specific things they can and cannot do, not necessarily a law. 

That being said, some type of recovery from the NP would be nice and feel more "fair" or perhaps if he does not feed off of enough negative emotions, he does not get the second +? I'm open to discussion, but for the most part this app is great. I love it.
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I get the concern, although I do feel the recovery is implied with the cost of activating a Noble Phantasm multiple times in a fight. While it wouldn't be at the cost of a true "final attack/transformation" Noble Phantasm, switching between the two forms constantly in combat would add up quite a bit in costs. There's also the action economy of donning and doffing the belt, which creates a minute but significant window of vulnerability. This, alongside his general playstyle, is why I feel the function of his transformation already comes with enough tradeoffs.

I suppose I should clarify his playstyle a bit, as well as the rationale behind the double modifiers. Stumpp's core gameplay loop goes against the grain of your usual Assassin. Rather than focusing on Master-killing and reconnaissance, he possesses a kit that mixes preparation and attrition fighting. Outside of his Noble Phantasm, he's essentially a worse Caster with a skillset that encourages staying in a fight.

The Noble Phantasm is meant to be an equalizer in that sense. The intent of the transformation is to let him fight in the same way as Knight-class Servants. This is achieved through physical modification, and a lot of that legwork comes from the modifiers. In this regard, he is a "monster" in a world of heroes, but even then his boosts are modest compared to actual monster transformations who walk into the room with A++ STR. Of course, he still has the chassis of an Assassin who lacks a martial legend, so he "balances out" vs the standard Knight-class Servant by lacking martial feats.

Most importantly, Stumpp's trump card is fighting at the baseline Knight-classes fight at. He's already fighting at a disadvantage against a Saber who could fight at his baseline (or potentially higher) without having to use a Noble Phantasm while still possessing a trump card of their own. His win condition relies on attrition so he could loop his skills properly, and adding a recovery cost to his transformation plays heavily against that.