Character sketch of Jerome.....a funny man....thinking anything to be a joke....lives the life the way it takes it practical thinking..just tries to do everything the way he is asked...has a dog..he loves food and hates workJerome K. Jerome is like the Victorian Bill Bryson. Three Men in a Boat is not a bad travelogueis thus confused by his symptoms that he refers to a medical book and happens to misconceive that he possesses virtually each doable ailment recorded in there. 

Character sketch of George - 
George was a bank clerk (who 'goes to sleep at a bank from ten to four each day, except Saturdays, when they wake him up and put him outside at two ') and was living in a back room of the same house. The landlady suggested that, to save money, the two might share a room. They 'chummed ' together for some years - both shared a love of the theatre -and a life-long friendship was formed. George, who remained a bachelor, rose to become manager of Barclays Bank in the Strand and outlived. 
Character sketch of Harris - 
Harris is a vain fellow who pretends to be extremely hard working but usually pushes off the burden on other people. he is outspoken and does not hesitate to tell his friends what he thinks about them even if it may not be pleasant. for example he outwardly tells george that his new blazer is utterly revolting and that he must not wear it around them (harris and j). when harris takes on a job he makes a huge fuss out of it like the narator;s uncle podger. it may not be anything majorly important but if harris is going to do it .... the world would know about it. he also thinks very highly of himself and his voice though his friends do not want him to even attempt singing. he is extremely fascinated by tombs and graveyards much to j 's dislike. he is also quite short tempered and it is best to let him rant off his anger rather than try and talk to him about it.he wouldn 't mind a drink at any time of the day and enjoys the company of his friends 

i read d book a few months back and could just remember few guidelines....maybe George's and Harris' characters are mixed up...hope this will help u
i ve given u all the three persons charracter sketch