I think it's less the boy who teases Chi is similar to Takagi (because his general demeanor is a bit different) and more that something in the Nishikata genes makes them attract/attracted to people who are like Takagi.
At this point I don't expect anything from both series, I just keep reading because they cute
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BUT BOY OH BOY CHI'S SCHOOL LIFE WOULD BE SOMETHING INTERESTING TO SEE also I want to see Chi's wedding (if that ever happens) so we can get Nishikata and Takagi completly emotional