Don't let the MC eat the DF. Only a covetous fool would do that. The origin of DF is unknown, simply because it gives it great power. Not that it's a good thing, remember! Never eat what you don't know.
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"Insert valid argument for a strong fruit here" - jokes aside, respectable choice, but I just don't like the absolute, maybe he could find one (even made up to suit him) that inspires him to eat it eventually later down the line, who knows!
The ton ton fruits, should be a good fit, don't affect much his sword style, but can increase power changing his weight and maybe float if it can become decimals