A couple of notes, first and foremost, one trade per rarity per week per unit (ie, no trading a 3, 4, 5 star marth, but a 3 star shanna, 4 star marth, and a grima)
Another 1, all units that are traded are treated like a newly summoned unit (so units that have mad skill inheritance can still be traded) and SP will be reset
Hero merit from a traded unit gets cut in half, hero merit grinding is a big thing now, so HM grinding with new units they don't have can be traded for, but this discourages people from trading seasonal units to grind HM
Make the currency a daily get instead of an hour requirement, I have no idea how much time I spend on heroes a day, but I'd love to be able to trade my girlfriend units she finds cute like tailtiu but I know she doesn't play 4 hours a week, so maybe have a daily quest that gives it? (So shards,feathers, crest/ orb, and then new currency?)
Everything else SHOULD be balanced as to benefit old players looking for elusive fodder, and new players looking for better IVs or favorite units to build a team, and look down on people abusing the system
Just my thoughts though, feel free to comment and disagree or modify it
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Fate Grand Order
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