You don't use robux to buy it you use money
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You cannot donate to player on Roblox who do not have BC.
You need to re-word your question for me to answer it.
If by 'roblox credit' you mean Tickets and Robux. Then no. You need to buy OBC or any type of BC for that matter with real money.
So you got BC, and bought a body on Roblox. If you no longer have bc, but own a body, then you can wear it. It does not matter, so long as you have the item.
Yes, unless you buy lifetime BC.