Is there a reason Gotou and Menthuthuyoupi look so similar? Is there a correlation between these two characters? I was wondering if the same illustrator drew both characters or if perhaps one of them was sort of a homage to the other.
I am just referencing nhahtdh's comment as the answer since it seems he does not want to post it as an answer. 

But the reason that there could be similar character design in two different animes could be due to:


  
  Author Influence 
  Limit in number of designs(birthday paradox) 
  Tracing(unlikely)