Teenage/YA vigilante turned villain 

Quirk is smog, can produce and breathe out poisons and shit, makes for a bad time 

Family name 荒 = Kou || Arara || Aragi || Araoka 

猛 takeru,  takeshi

吸川 == Suikawa

猛烈

???. Gaseous immunity & the ability to  exhale various Gases. Gases have no effect on him, no matter how toxic and  if they effect it's targets through inhalation or contact (this includes things like gaseous anaesthesia, like sleeping or laughing gas). Is affected by liquids as normal but any gas, so long as Oxygen or Hydrogen is present in thr gas hes good. 

http://www.dehs.umn.edu/ressafety_rsp_pg.htm

He's currently between jobs and works as a small time villain/conartist o3ob