Mark is a Direct  person.  The Direct person is candid and results oriented.  Mark skips  over all the background and gets right to the point.  He reports a demon  being cast out in the 25th verse of the first chapter.  Mark uses the  Greek word "euthus" (immediately) more times the all the other gospel  writers combined.  He wrote the shortest gospel ... the first one on the  market. 

 John is an  Extroverted person.  The Extrovert is people oriented, they like people  and want to be liked in return, they are talkative and outgoing. John  went around calling himself the "beloved disciple"...Jesus loved them  all the same or he would have been a "respecter of persons".  The  Extrovert knows when someone cares about him.  John wanted people to be  part of the team and became upset when he saw other people casting out  demons.  Jesus told him if they are not against us they are for us.  At  the end of his 2nd epistle he writes: "Having many things to write unto  you, I would not write with paper and ink: but I trust to come unto you,  and speak face to face, that our joy may be full." and again at the end  of his 3rd epistle he writes: "But I trust I shall shortly see thee,  and we shall speak face to face."  Extroverts would rather talk about it  than write about it. 

 Luke is a Paced  person.  The Paced person is easy going, harmony oriented and  persistent.  Luke was a good listener.  He was not an eye witness.  He  had the ability to "hang in there"...the only one that could really work  with Paul.  In 2 Timothy 4:11 Paul wrote that the only one with him at  one point was Luke.  He was relationship oriented starting his gospel  talking about Jesus' family history.  His gospel was written so smoothly  that it later became the script for the movie "Jesus". 

 Matthew is a  Structured person.  The Structured person is careful, thorough, precise  and meticulous.  Matthew was a tax collector by occupation...he had to  be good with details.  He was a Jew writing to the Jews about a Jew.  He  started the history of Jesus with Abraham rather than with Adam.  His  gospel is well organized by teaching.  It contains over sixty five  references to the Old Testament, forty-three of these being direct  verbal citations, used to prove the deity of Jesus thus greatly  outnumbering those found in the other Gospels.