i heard you aren't mine to save

✔ Backtagging
✔ Fourth-walling
✔ Threadjacking
✔ Offensive Subjects

✔ Romance (develop&discuss!)
✔ Fighting
✔ Injury
✔ Death (develop&discuss!)
✔ Telepathy/Mind-reading/Magic

Masanosuke isn't an inherently offensive characters so he's unlikely to cross boundaries. I, the player, have no limits you could cross as long as it's done ICly and more sensitive plots are discussed OOCly. You've got a greenlight on pretty much everything!