SWITCH - Question deleting exported character

So I've been playing around with the tomes of stat growths and figured I would create a stat god character.
I exported my character. Grinded the tomes and repeated.
Then I noticed that I have a number of duplicate character files.
How do I delete the unneeded characters?
I plan on playing this game a fair bit and having a mess of files seems unnecessary.
On SWITCH.
I exported my character. Grinded the tomes and repeated.
Then I noticed that I have a number of duplicate character files.
How do I delete the unneeded characters?
I plan on playing this game a fair bit and having a mess of files seems unnecessary.
On SWITCH.
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