Thermal abilities Steven can withstand higher temperatures than other humans. He can overheat from excessive use of diamond abilities. Though homeostasis can be gained with more training
- maybe a Bismuth fusion that can see thermal readings
Vibrations can offer information via stomping the ground to produce sound waves then measure them.
- check for traffic congestion, cartographic readings of location, discover buried gem tech
This ability requires concentration. It however can alert a hidden gem monster of presence, can affect seismograph readings
- a lapis fusion may be great
Alchemy Them going FullMetal Alchemist is interesting. Just combining raw materials and summoning regular human items like a hammer, cup, or knives etc. (not too high on my list may be better for a fusion)
- This is perfect for a Peridot fusion
Depicted below are enhancers for directing yellow’s kinetic energy. I’m going magical girl mode and wanna use some type of gadget instead of SU Jasper’s taser-shaped destabilizer.