I've been digging through my reference books and Google searches, but I'm not getting anywhere with this.
For "Only I [do X]", can the subject of the sentence simply be 私だけは?
"Only I eat fish on the train."
And could that be done with an adjective like 好き or ほしい?
"Only I like tempura pizza."
For my final act, I'm going way out on a limb here, but how would I say "I am the only [Y] that [likes X]?" This is the mess that I came up with:
I am the only American who likes The Tower Of Druaga. (Or more literally, "As for Americans that like The Tower Of Druaga, it's only me.")
How wrong is all of that? Because I'm pretty certain it's not correct.