Fire&Ice

Fire&Ice is the het ship between Shoto Todoroki and Weiss Schnee from the My Hero Academia and RWBY fandoms.

Canon
As Weiss and Shoto are from different series, even though both of their home universes have superheroes, they have never met in canon.

Weiss and Shoto have both started out as children of people who hold great influence in their respective worlds, and supposedly have an easy childhood but actually don't. Their fathers married for money and Quirks respectively, and abused their wives and children.

Similar to how Weiss's first meeting with Ruby Rose ended up with Ruby getting a bad impression of Weiss, Shoto started his relationship with Izuku by declaring war on the latter, although both later became good friends with the main characters of their respective series, and eventually spill their abusive pasts to them.

Like many young heroes, the two have faced their fair share of struggles from mistakes they have made as the results sometimes put others in danger or having other people doubt the two from not believing in their abilities. As well as them needing to focus on their school studies despite having a lot in their minds. Like when the two are forced to break one or two rules for the sake of helping others. Due to their kind hearts, willing to listen to other people's troubles to see if they can help them and refusal to give up when it matters. Some of the people in Shoto's group of friends are a little similar to Weiss's in traits, personalities and how they treat the two.

Fanon
Fire&Ice is one of the well liked ships of the ML/RWBY crossover fandom. Some fanfics and art have the two existing in the same universe, where they are both U.A. or Beacon Academy students, or have Weiss traveling to Shoto's universe.

Trivia

 * Both Shoto and Weiss have a habit of using ice in their battles, though for Weiss it is pure preference, and for Shoto it is an act of defiance against his father.
 * Both have scars over their left eye, which are indirectly caused by their fathers.