Board Thread:Off Topic/@comment-12443850-20130825173028/@comment-226878-20140608012002

Si and Ti are Mercury/Emerald's twins.

Si (pronounced with a long i) has grey hair like Mercury's but his outfit is slightly more... shiny. His name comes from silex which means "flint" and his weapon is likewise an old flintlock pistol which utilizes Dust in its firing mechanism. Si's semblance allows him to adjust the density of any object and create a form of vacuum seal between multiple objects that are near each other. The main use of this ability goes to his weapon. He doesn't need to "pack" the Dust into the barrel. He simply slips in a corked vial and his semblance "packs" the barrel for him. Adjusting the density of the cork turns it into a bullet. He can also lock two larger objects (or people) together, but it takes all of his concentration to maintain. Si has tried using his density shifting on himself. He gets cripplingly ill as a result.

Ti (from tito meaning "sun") is a blonde with a flamboyant "rainbow" outfit, though his primary identifying color is blue. His weapon is a fan the length of his arm. It is infused with fire Dust. His semblance "Air" allows him to augment the strength and range of the flames which his fan will unleash.

I was inspired during a visit to a rock shop wherein I saw bits of metallic Silicon and Titanium.