Writing for anime voice actors is a different beast from regular screenplays. The words have to breathe on their own, without the visual crutch. I always start by timing the animatic or storyboard to the millisecond—if a line needs to fit a five-second lip flap, you get maybe twelve syllables, not a soliloquy. You're writing for performance, so you annotate the hell out of the margins: where to gasp, where the voice cracks, where there's a half-beat of silence that says more than the line. The script isn't just dialogue; it's a map for the actor's throat.
Forget flowery prose. The language has to be economical but packed with subtext. An 'I see' can carry resentment, awe, or defeat depending on the character's arc. You also need to leave room for the director and actor to play. Sometimes my most precise stage directions get tossed because the seiyuu brings something I never imagined, and that's the point. The best scripts are sturdy skeletons they can build a performance on, not cages.