If you could just get your soul to open the window to shellfish, you'll grow accustomed to them sooner or later! I know shellfish are a bit of an acquired taste, but if you don't open that window, you'll never like them!
You'll need to become accustomed to eating shellfish if you want to grow up big and strong like Genghis Khan (かん). He didn't have shellfish growing up either you know, he had to grow accustomed to their taste too, but look how successful he was!
Currently there are no similar looking kanji which exist in the WaniKani learning system