I only ever drink cold brew as the occasional treat at a cafe. I have a moka pot at home and just have that coffee over ice. I personally found myself struggling to make it well at home.
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It tastes a bit less acidic or smoother than traditional coffee. You really notice the difference comparing a black cold brew to a black iced americano.
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You can serve it chilled or over ice. I’ve never heard of reheating it but if you were to try I’d suggest a low heat and to reheat slowly. You might introduce a burnt taste to it if it’s under high heat.
You could try framing it, maybe with a picture of your dad doing kendo or just you two together. There are places that do custom framing and will put it all together ready to hang on your wall. The sentimental additions to the case the sword ends up in should take all the edginess away.