These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Afterschool Charisma
Moe: Hitler, of all people. He's quite the Nice Guyat first and his friendship with Shiro is adorable.
As noted above, Einstein gropes Shiro at one point.
There's Shiro and Hitler's odd friendship which only gets stronger (at least on Hitler's side) after Joan's death.
See Rockwell's remarks under Bi The Way.
Mozart initially can't stand the idea of Shiro touching him. Then they discover that Shiro might be a clone, and Mozart is suddenly all over him. Granted, this just seems to be Mozart's way of taunting him.