[Shoto adheres to whatever makes someone comfortable, but... no he really thinks it's an kindly thing of someone who certainly deserves that sort of respect of not just 'last name' but also not just 'first name'.]

Moon Supreme. [Since they're BEST FRIENDS NOW WHO SHARE BOTH NAMES:] You can call me Shoto. My full name is Shoto Todoroki, but I don't mind you using Shoto if we're going to be shortening full names.