I have had a lot of ideas about this; so why not throw them here.
Whilst making an anime out of each game is fine and all, I sort of enjoy seeing fresh material.
For example..
- delving into a character's past
- seeing how certain people became who/what they are known as now
- a look at what happened between the events of Mystic Square and Scarlet Devil (This one is VITAL!)
I could go on, but I'm sure you get the picture.
Another one I'd certainly like the idea of is implementing an anime arc for Maribel and Renko. Original episodes for the most part, detailing their life, but throwing in the odd episode that would reflect one of the stories from the CDs; since it really wouldn't be right if it didn't at least connect those in to them.
Stories that were barely touched, or briefly mentioned, would be very ideal to be turned into an anime; possibly an OVA and/or animated movie depending on the event itself. (The build-up to the Creation of the Great Border being an example; the first Lunar War being a possibility too, along with the initial vampire incident.)
Another thing worth pointing out when doing the fight scenes is to take into account when said fight is happening. Sure, in this day, it's mostly clothes being torn and stuff (and no, I'm not trying to dish out 'fan-service.' Panty shots and constant boob bouncing are not needed in this!); but everyone knows that blood probably spilled a lot before the spell card rules came into play. That's also not to say no blood will spill during the present day fights too; there will be situations where it will flow, we just need to remember who is involved and will it really cause said incident.
...
I'm putting too much thought into this. :3