Lancer being first intentional. This is how it is in the Vita.
Regarding gradient - I'd like both versions (will probably use gradient in-game).
Yes to pillar boxing.
Webp for HD and png for SD.
Even for mini I'd like a high resolution. I won't use it in game, but I'd like the highest resolution to keep as source for future changes.
I already waifu'd all the missing assets for the next version.