Marvel: Cryokinesis

Idie Okonkwo (Oya)
Oya is able to reduce the kinetic energy of atoms and, thus, reduce temperature, often used to generate ice.

Robert Drake (Iceman)
Iceman can use his mutant ability to control moisture such as to freeze any air moisture into super-hard ice. This ice can be formed into any object of his choosing; the only limitations are his own imagination, and the ambient air temperature which determines how long his ice sculpture will stay icy. He does not have to hold the ice physically with his hands in order to shape it. Apparently he can simply direct the waves of coldness he projects in certain ways so as to create ice in the shape he desires. In the past, Iceman has formed ice-ladders, ice-slides, ice-shields, ice-bats and other constructs of ice. Iceman has created constructs of ice so powerful that he was able to easily encase and contain the likes of the Hulk with him being unable to break out of it for quite some time. On at least one occasion, he has even been shown to make it snow or cause a blizzard.

Iceman is able to form a rising column of ice beneath his feet, capable of lifting him off the ground. The tensile strength of the column is determined by its thickness, and its steadiness by how well it has been braced. A well-braced and regular column, 6 feet in diameter at its base, is able to support his weight without toppling for about 85 feet in a 40-mile per hour wind. By forming long ice-ramps connected either to his ice-column or to an existing structure like a building or a bridge, Iceman is able to travel above the ground by sliding down the ramp he is creating. Unless he creates supports periodically, the ramp will crack beneath him, unable to support their combined weight. Iceman although has shown that he is not limited to creating constructs and can fly on his own with his control over moisture.

Iceman's control of his powers are so vast that it extends to the molecular level, to the point that he can freeze all of the molecules of an object/being with a thought. An example would be freezing blood in the veins, thereby stopping flow to the brain. He has demonstrated the ability to control chemical reactions on the molecular level, at one point preventing Sunfire from accessing his powers.