The 71-year-old was last seen on Leeds Street in Doncaster East at around 1:00 pm on Wednesday.
Romeo is described as having a shaved head and was wearing a black t-shirt, dark grey track pants, grey fleece jumper and a beanie.
Police and family have concerns for his welfare due to his age and it is out of character for him to not make contact with family.
Police have released an image of Romeo in the hope someone recognises him and can provide information regarding his current whereabouts.
Anyone with information about him is urged to contact Doncaster Police Station on (03) 8841 3999.