Theodore, from Birkenhead, was last seen on Beckwith Street at 5am on Friday 4th December.
He is described as a black African male, 5ft 11in tall, of slim build, with short shaven black hair, and brown eyes.
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When last seen he was wearing an orange beanie hat, brown North Face coat and carrying a black rucksack.
Theodore speaks with a Liverpool/African accent (he is originally from Botswana) and is known to frequent Liverpool City centre.