|“||I miss you. Every day I miss you.||”|
Diego and his family grew up in Mexico. Diego was a skilled Shadowhunter. He attended the Scholomance at a young age when it was reopened after the Dark War; he graduated soon after and became one of the youngest ever to become Centurion.
Diego fell in love with a childhood friend Cristina Rosales. The two eventually entered a relationship and had plans to marry, while she also planned to become parabatai with his younger brother, Jaime. Cristina's mother greatly approved of their union.
When the Cold Peace began, the Rosales families were told to surrender a powerful heirloom, among other gifts from their hadas connections, to the Clave, particularly as the Dearborns and the Cohort began to demand it. Instead of turning the heirloom over directly, they falsely told them that only a Rosales could make the object work.
In May 2012, he and Jaime were at the Rosales residence at San Miguel de Allende with Cristina. One night, an intoxicated Jaime told Diego of his ill intentions with Cristina, while Diego remained silent to let him talk it all out. Diego meant to warn Cristina during Jaime's trip to Idris but never got the chance because Cristina, who overheard Jaime's rantings that night, fled to Los Angeles to get away from them, her sudden departure devastating and surprising him, clueless to why she did so.
With Cristina and their strongest connection to the D.F. Institute gone, they became more pressured to give or hide their heirloom. To delay the Dearborns' demands for the heirloom, Diego tied himself to the Cohort in an arranged marriage to Zara Dearborn, while Jaime took the heirloom and went into hiding.
When Diego heard of reports of necromantic magic activity in Los Angeles, and of Emma Carstairs's belief that her parents were killed by something other than Sebastian Morgenstern's army, he went to investigate on behalf of the Scholomance. He first visited the Los Angeles Institute to talk with the head, Arthur Blackthorn, but was immediately turned away. Deciding to investigate the matter on his own, he bought weapons at the Shadow Market, specifically from Johnny Rook, who tricked him into buying bolts tinged with belladonna poison.
The investigation led him to the body drop behind the Sepulchre Bar, shortly before Emma and Cristina arrived at the scene to investigate as well, though they never crossed paths. There, she found Followers of the Guardian beating Ava Leigh and stopped them. Ava Leigh escaped and he tracked her down to the house where she lived with her boyfriend, Stanley Wells, who was also the latest victim of the killings in L.A.. While there, Emma and Julian Blackthorn arrived; not recognizing them, he assumed them to be the murderers. He hit Julian with his bolts, not realizing that he was a Shadowhunter and that his bolts were deadly poisonous, and fled when Emma gave chase.
While chasing down Casper Sterling, one of the Followers, he ran into Emma and Cristina. He was shocked and delighted to see Cristina again. He later fought alongside Cristina, Emma, and the Blackthorns to rescue Octavian Blackthorn and prevent the warlock Malcolm Fade from sacrificing the former to resurrect his lover, Annabel Blackthorn.
When the Clave was finally alerted to the recent events, Diego stood by his decisions and testified to Robert Lightwood that he believed that the Blackthorns' did what was necessary. Robert decided not to punish Diego or strip him of his position because he was supposedly one of their best warriors. After clarifying to Cristina the circumstances of Jaime's statements, the couple reconciled.
Search for Malcolm
In response to the sudden surge in sea demon activity in L.A., suspected to be connected to Malcolm's death, a large group of Centurions arrived to stay at the L.A. Institute to search for Malcolm's body and the Black Volume of the Dead, which went missing at sea after his deadly confrontation with Emma. Diego's initial delight turned into dread when the group included Zara, his fiancée, thus ending his just rekindled relationship with Cristina.
One evening, after several nights of fruitless searches, Malcolm himself attacked the Institute with a horde of sea demons. Malcolm demanded a Blackthorn sacrifice, prompting them to flee, leaving Diego and the other Centurions to remain and fight off the demons Malcolm set on them.
Cristina ended up at the London Institute with Emma and the Blackthorns. Unable to contact her because of how close Zara was watching his every move, he passed a letter to her through Jaime, instead.
Some time after—upon Arthur and Malcolm's deaths, with Zara claiming the responsibility and honor of the latter—at a Council meeting for Annabel Blackthorn and Kieran's testimonies, Diego attended with the other Centurions. Cristina finally spoke to him, no longer angry but also now accepting that she was no longer in love with him. She asked him a favor: to protect Kieran, expecting things to go wrong, and to take him to the Scholomance with him.
Diego, Divya Joshi, and Rayan Maduabuchi, hid Kieran at the Scholomance, believing the Cohort would not find them. When Zara Dearborn and her group returned, they caught Kieran and tried to torture him in the Hollow Place. Samantha Larkspear tripped and fell in, and the water made her relive every awful memory of her crimes. Kieran pulled her out, but the Cohort put the blame on him and tried to take him back to Idris. Diego and Kieran ran to the library, where Kieran summoned his faerie steed, Windspear and escaped, while Diego and his friends were taken into custody and brought before the Gard as "traitors". Since the Cohort drew Quietude runes on them, they were unable to speak in on their defense.
Diego was then imprisoned in a cell with a heavily injured Jaime. As Jaime's wound got infected, Diego begged the Cohort to give him a stele so that he could draw a Healing rune on his brother, to no avail.
Eventually, Anush Joshi slipped a stele while delivering food for them, then told them that he planned on joining the resistance. Diego and Jaime escaped and joined Livia's Watch in time for the battle against the Cohort.
Diego has thick, dark hair, dark eyes with high cheekbones, and olive-toned skin.
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Diego is a masculine Spanish name, possibly a shortened form of Santiago, which means "Saint James", derived from Spanish santo "saint" combined with Yago, an old Spanish form of James, the patron saint of Spain. In medieval records, Diego was Latinized as Didacus, and it has been suggested that it in fact derives from Greek διδαχη (didache) "teaching". Diego is also considered the Hispanic version of James—primarily due to their connection with the biblical character Ya'akov (Jacob)—which means "supplanter; he that replaces".
His maternal surname Rosales was derived from the Latin word "rosa" and is the plural form of the Spanish word "rosal", both of which mean "rosebush". His paternal surname Rocío is of both Italian and Spanish origin, where it means "dewdrops", or simply "dew".
- Diego's favorite meal is breakfast, to the point where he also enjoys having breakfast food for dinner. When he was growing up, he would often get up early to surprise his family with chilaquiles.
- Diego's favorite weapon is the axe.
- He was initially set to be younger than Jaime.
- It has been implied that Divya Joshi is Diego's new love interest.
- ↑ 1.0 1.1 1.2 1.3 Lady Midnight
- ↑ 2.0 2.1 2.2 2.3 Lord of Shadows
- ↑ Queen of Air and Darknes
- ↑ Behind the Name: Diego and Santiago
- ↑ How Are the Names 'James' and 'Diego' Related?
- ↑ Diego on SheKnows
- ↑ Rosales on Familycrestdb
- ↑ Meaning of Rocio
- ↑ Rocío on Baby Name Wizard
- ↑ Archive of surname explanation Tumblr post
- ↑ 11.0 11.1 A History of Notable Shadowhunters & Denizens of the Downworld
- ↑ "16 and 18." Cassandra Clare on Twitter
- ↑ "Diego is younger." Cassandra Clare on Twitter
- ↑ Queen of Air and Darkness
- ↑ "I think if you look closely you can see who his new love interest is in Queen!" Cassandra Clare on Tumblr