
"What do you mean, 'slow of mind'?": Groo is often called "slow of mind", but it is usually much later in the story when he finally responds to it.The con fell apart, but the phrase still sticks in Groo's head, and he says it from time to time when he cannot think of anything to say. "I am the Prince of Chichester.": Granny Groo once made Groo memorize that phrase during one of their ill-fated scams.(A letter from a fan once pointed out that since "to err is human", the constantly-erring Groo must be the most human character ever created.) "Did I err?": Groo's understatement when he surveys the destruction he has caused.It was later revealed that the Sage's dog, whose name had long been a mystery, was called Mulch. The Marvel/Epic editions had a long-running gag in the letter column, in which fans would ask Mark Evanier to define "mulch" and he would oblige with the same dictionary definition in every issue. Mulch: This agricultural process is often mentioned in casual conversation.Whenever Groo comes across money, cheese dip is the first thing that comes to his mind. The handle of the minstrel’s mandolin changes shape in every panel.Almost every Groo story ends with a moral. Mendicant: Groo becomes violently angry whenever someone calls him a mendicant, even though he doesn't know what it means.Groo's adventures have resulted in these "running gags" that have become staples for years. The Witch of Kaan, an eccentric old hag who always has a potion ready for anybody who visits her.Grativo the Wizard, who often punishes Arba and Dakarba for their failures.Their dealings with Groo have often left them in trouble with the people they were scamming. The diminutive Pal is always looking for easy money, but his hulking partner Drumm isn't very bright. However, her occasional reliance on her brother for aid has spelled disaster every time, and she despises him. While she greatly resembles her brother, the two of them are totally different: Grooella is a queen. Granny Groo often tries to use her grandson to aid her in her moneymaking schemes, but invariably ends up giving him a good spanking when he fails. Granny Groo, Groo's gypsy grandmother.He has often enlisted Groo as his "lackey", and while Groo has succeeded in his quests time and again, Arcadio always gets the credit. Arcadio, a handsome warrior who is considered the greatest hero of his time.They have repeatedly been stripped of their powers because of him. Arba and Dakarba, a mother/daughter pair of witches who have suffered much trying to take advantage of Groo.Taranto, a corrupt general who has had his plans for glory dashed by Groo several times, and is obsessed with killing the wanderer.

However, she repeatedly turns down his idiotic advances. Chakaal is strong, noble, and wise, and Groo is madly in love with her.

Such is Groo's incompetence that so much as stepping onto a ship will cause it to sink. Towns, civilizations, businesses and cultures have all been unwittingly destroyed by Groo. Groo occasionally meets with respect and good fortune, but it does not last. Most of his adventures end with him walking away oblivious to the mayhem he has wrought, or fleeing an angry mob.

Groo the Wanderer is a dark-ages-era large-nosed buffoon who constantly misunderstands his surroundings, and, despite his generally good intentions, causes mass destruction wherever he goes.
