Nah, it's definitely a real person. The way our brain works is that it generates speech and ideas very rapidly. We all have a filter which checks the generated speech and ideas to see whether they are viable. Viable ones are let through. Nonsensical or contradictory ones are discarded. They don't enter the conscious. While we all have a filter like this, every person's filter is of different strength. An engineer's mind has a strong filter. Only good ideas make it through. An artist has a weak filter. That's where their creativity comes from. Most people are somewhere in between. A weak or strong filter is neither good nor bad. They are adaptations to different environments. Some psychedelic drugs are known to weaken the filter and do so permanently. A very weak filter can also be the result of mental illness or brain damage.