Not gonna lie, I prefer ‘senpai’, and ‘Shion’ (with that one it's because to me it seems strange hearing people's names differently to how they are written) but at the end of the day it doesn't matter all that much. Thanks for subbing it either way :)

I prefer senpai and Shion as well and overall the Hepburn romanization system but feel free to do what you want with your subtitles.

>sempai PLS L S

Sempai.... really?