Izuku is a chaotic bisexual.

Hitoshi is a chaotic pansexual.

Mei is a chaotic omnisexual.

They all look out for and defend eachother if anyone starts trying to invalidate the others.
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Bisexual: Being attracted to 2 or more genders.

Pansexual: Being 'Gender blind' when it comes to attraction.

Omnisexual: Similar to Pansexuals, except they do have a preference for one gender over the others, but in the long run it doesn't matter.

Feel free to correct me on that if you know something I don't 💚💜💖