It just needs a logical basis on how it works. Todoroki essentially has two quirks but they work in tandem because that's how his body works for example. He has extreme heat but it will overclock his body if he uses it too much forcing him to use his cold side to cool him down. Gran Torino can jump all over the place because his body has essentially heightened jumping power thanks to his feet. Iida requires him to manage his running speed or it blows out his legs. My Hero works on a logical basis, normally, so it requires that i ask the same of you all to the same extent.