<P> Percy's other important romantic relationship occurs in the interim of his first . As the final battle with the Titans approaches after The Battle of the Labyrinth, Percy spends time with his mortal friend Rachel Dare . Their relationship causes conflict between Percy and Annabeth Chase . Towards the end of The Last Olympian Rachel realizes that her attraction is not to Percy, but to his mythological world, because of her destiny as the next Oracle of Delphi . </P> <P> Three other characters in the novels are romantically interested in Percy, though he remains mostly oblivious . Nico di Angelo's hero worship of Percy turns into an ever - worsening crush on him; at the same time, Nico resents Percy because he believes the son of Poseidon allowed his sister Bianca to die in battle . The second is Calypso, who was banished to the island of Ogygia . Calypso later meets Percy's friend Leo Valdez; he manages to save her, where Percy could not . The third is Reyna Ramírez - Arellano, who, silently attracted to her comrade Jason Grace, finds herself attracted to many of Percy's similar traits . </P> <P> Percy has several animal companions . The first is Blackjack, a black pegasus that Percy liberates from the Princess Andromeda in The Sea of Monsters . Blackjack is first referred to as a "mare" in The Sea of Monsters, though he is called a stallion in all later books . Blackjack becomes Percy's personal steed and companion . Blackjack is unfailingly loyal to Percy, and on several occasions manages to save Percy's life . Blackjack always calls Percy "boss" and is quite fond of sugar cubes and doughnuts . Blackjack has two friends named Porkpie and Guido, both white pegasi, who sometimes accompany him . All three are intelligent beings capable of interacting with other demigods independent of their horse - to - human translator, Percy . </P> <P> Percy's second magical companion is Mrs. O'Leary, who is introduced in the fourth novel, Battle of the Labyrinth . She is a hellhound that he receives from Daedalus (whom Percy meets as a sword master named Quintus) before the inventor dies . Though Mrs. O'Leary is described as "the size of a tank", the magical veil known as the Mist causes her to appear as a poodle to mortals . Percy often refers to her as "his dog". Percy sometimes uses Mrs. O'Leary's ability to "shadow travel" to cross large distances almost instantaneously . His brother Tyson and friend Charles Beckendorf are Mrs. O'Leary's other caretakers, though she is also fond of Nico di Angelo, son of Hades . </P>

Physical description of percy jackson in the lightning thief