Lol fun, I like it. Off the top of my head:
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He’s 100% forgotten the names of body parts. It’s a routine stumbling block in conversation.
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Use random tables full of sentence fragments to MadLibs his stories. Ask for a moment or two to stitch it together properly so it almost makes sense, your players won’t mind.
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You’ll have to let him do huge wizard shit once in a while when its needed most. It’s okay, even if it feels like cheating. If they’ve put in the effort to maintain the relationship, its a Chekov’s Gun and it has to go off sooner or later.
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He calls everyone by the wrong names
I’ll try to keep adding as they come to me