As these are (mostly) edits of MV's sprites, you will need a legal copy of RPG maker MV, otherwise~~
具有MV本体
Credit is appreciated, but not required.
可标注出处,非必须
They are free to use for commercial or non commercial.
免费用于商业、非商业
You are free to edit, change, recolor, re-edit, remix, maim, mangle, add on, divide, and conquer to your heart's content. I don't even mind if you re-upload them elsewhere as it would only mean more people get access to them and that is A-OK in my books