User blog comment:Nep-Nep/Sei Shōnagon/@comment-24978536-20190403123741

Her gameplay kit, which has some unique-ish things, including Order change servant version.

Now, order change is a potentially gamebreaking effect, so including it into a servant's kit is bound to lead to some problems, such as future game design limitations, overuse of a single servant and such. Slapping an permanent debuff on the switched out servant will prevent at least some issues, like buff stacking, but honestly, it is still a quite dangerous game effect.

Shōnagon's skill combined with Chaldea Combat Uniform's skill gives 2 changes in a short time, which alone gives the possibility of stacking a huge amount of buffs on a single servant. To combat this, Shōnagon herself should not be either, a powerful offensive servant or a powerful buffer, so that not too many buffs can be placed on a single servant.

The problem is, I wanted her NP to have a self-damage effect for lore reasons. Like, something similar to an ex-chuunibyou looking back at his/her past, taking extreme damage from it. Shōnagon is not exactly a chuunibyou of course, but anyway. A demerit in a NP requires an otherwise powerful NP - as such, I figured I should only give her very limited amount of self-buffs that still somehow fit her, like the Max HP, that actually raises her damage output somewhat, due to the extra damage from higher Max HP.

Ugh, just noticed her NP was somehow unsaved... I'll have to edit that.