Gigantification

Titan Transformation is a Quirk used by Mount Lady. This Quirk allows her to grow to titan size.

Information
From Izuku's thought's after seeing Mount Lady's fight:

Titan's Transformation, huh...?

It is true that it is quite popular and it is really great "individuality"

But when you consider the damage caused to the city, can you fear a bad cost-benefit ratio and limitations of use to come? No... it might depend on whether she can grow at will or not.