Quirk Marriages

Quirk Marriages (個性婚) are marriages that began to appear after Quirks manifested in society, sometime during the second and third generation of Quirk users.

Description
These marriages were arranged with the sole purpose of choosing and/or enhancing a specific Quirk to be inherited down the bloodline, as a child will either inherit the father's Quirk, the mother's Quirk, or a new Quirk that's a combination of the two.

Attempting to create "custom children" solely for the sake of experimenting with superpowers was quickly deemed an unethical taboo by society.

Enji and Rei Todoroki

 * Toya Todoroki
 * Blueflame: A Quirk that generates blue flames with greater power than Enji's Hellflame, but gives him Rei's resistance to cold instead of Enji's resistance to heat, limiting his usage.
 * Fuyumi Todoroki
 * Frost: A Quirk that's almost the same as Rei's ice Quirk.
 * Natsuo Todoroki
 * Frost: A Quirk that's almost the same as Rei's ice Quirk.
 * Shoto Todoroki
 * Half-Cold Half-Hot: A Quirk that generates the flames of Enji's Hellflame and the ice of Rei's Frost Quirk, splitting the power right down the middle.