Hello there!
First of all, I am very impressed by this amazing and helpful project. A very big THANK YOU to everyone who invested their free time and effort to create and share these with us all. You certainly have my gratitude.
And about the "Type" field... of course this is your decision, but actually I also think some sort of letter instead (depending on the card and like already suggested here) would be quite nicer indeed. Taken from the "How to Play" page of Serenes Forest:
11 - Unit Type and Class - This is also more in aesthetics or for the sake of putting it there to make it descriptive, but a unitโs class determines the affinities they get. As for unit type, these will be known as Base, Promoted, Master Class, Overclass or Fixed Class. None of these really matter towards the rules, at the end of the day itโs just aesthetics.
I can't read Japanese and don't know the rules (yet), but it sounds like B (Base), P (Promoted), MC or M (Master Class), O (Overclass) and F (Fixed Class) could be used?
Just wanted to add my thoughts about this and thank you for reading!