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Derek Stiles

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Derek Stiles
Occupation Surgeon
Japanese Name Tsukimori Kousuke (月森孝介)
Age 26 (Under the Knife/Second Opinion)
28 (Trauma Team)
29 (Under the Knife 2)
36 (New Blood)
Eyes Brown
Family Unnamed father [Deceased]
Unnamed mother
Tama [deceased pet cat]
Friends Angie Thompson
Tyler Chase
Naomi Kimishima
Mary Fulton
Gabriel Cunningham
Leslie Sears
Victor Niguel
Cybil Kasal
Heather Ross
Adel Tulba
Sidney Kasal
Greg Kasal
Affiliates Greg Kasal
Robert Hoffman
Victor Niguel
Hope Hospital (formerly)
Caduceus USA
"I will save this patient!"

Dr. Derek Stiles (1992-?) is a surgeon, gifted with the Healing Touch.

Derek finished his residency and worked in Hope Hospital in Angeles Bay but transferred to Caduceus USA shortly after saving Linda Reid from Kyriaki.

Background Edit

Derek grew up in Northridge, a suburb just outside Angeles Bay. He decided to become a surgeon after losing his father to an incurable disease.

After completing his residency at the beginning of Under the Knife/Second Opinion, he was eager to start operating as a full time surgeon. While he was, at first, slightly irresponsible, he eventually pulled his act together in order to save a car accident victim while no other doctors were available.

Derek soon was discovered to possess the Healing Touch. While Robert Hoffman discouraged him from using it, Derek practises until he can invoke it at will. It is helpful to note that his form of this skill is linked to Asclepius, the Greek god of medicine. He would tense his index finger and imagine a star, then focus on it to gain an augmented state of concentration.

After a successful operation, Derek was noted for his abilities and was offered a job at Caduceus USA. Initially preferring to continue work at Hope Hospital, he eventually understood the threat of GUILT and joined Caduceus, eventually working to become the man to end the threat of GUILT.

Trauma Team Edit

Derek makes a few cameos in Trauma Team, though his face never seen. He is the one who has diagnosed Naomi Kimishima with the genetic disease she was afflicted with, and gave instructions, via phone call, to CR-S01 on how to treat Twisted Rosalia when Naomi became infected with it.

Under the Knife 2 Edit

Ever since ending the threat posed by GUILT three years ago, Derek has become a world-renowned surgeon. He is dedicated to his employer, Caduceus, and his job: saving patients. During surgery he is calm and collected- not one to crack under pressure.  However, during this title he had problems with being overconfident and taking pride in his Healing Touch. After relying on it in a certain operation and failing, he realized how conceited he had been. 

Trauma Center: New Blood Edit

Derek and Angie both appear in Chapter 7-4 of New Blood as representatives of Caduceus Japan, providing information on Stigma. Additionally, they are seen in the side operation, Challenge 4. In it, he tests Markus and Valerie using a simulation made by Caduceus's research director (assumed to be Victor) that contains Cheir and Soma, as well as some of the original GUILT, namely Immature Kyriaki, Mature Kyriaki, Deftera, and Immature Savato.

Personality Edit

Derek is a hard working surgeon willing to do anything for his patients, although he wasn't always this way.

In Under the Knife/Second Opinion, Derek shows a lack of focus and attention which almost caused one of his patients to die. Following the incident, Angie yells at him and questions him becoming a doctor, so he believes he is useless as one. While off duty, he hears about a car crash and realizes that nobody at Hope Hospital would be able to save the victims in time. Following a single-handed rescue operation, Derek becomes more confident.

Throughout the series, it is hinted that Derek has a severe problem with solving puzzles.

It has also been seen that Derek is a bit of a flirt when it comes to older women, to the point where he's been called "very smooth". Unfortunately, when he is caught off guard and asked about who he truly loves, he becomes embarrassed and shy.

There is an implied relationship between him and Angie Thompson. At the end of Under the Knife 2, the relationship between Angie and Derek seems to be stronger, but they remain good friends and there is no direct proof of a real relationship between them.


"I won't let you take Dr. Hoffman!" - Trauma Center: Second Opinion Vulnerability

"I won't let you die!" Operation Diagnose quote

"I won't let Professor Blackwell die!" Death Awaits All


  • Derek's initials are DS, showing that he was named for the first system the series appeared on. He also appears in Second Opinion and New Blood respectively, although Second Opinion is simply a Wii remake of the first game, Under the Knife.
    • Derek's last name 'Stiles' may also come from stylus, used to use the touch screen on the DS.
    • With this being true, Derek's first name may come from 'direct'.
  • Derek is the first playable surgeon that the player has the opportunity to operate on.
  • Derek is one of two patients that become infected with two types of GUILT at the same time, Paraskevi and Kyriaki.
    • The other patient is found in Second Opinion's Z-5, Sayonara, infected with Blue Savato and Kyriaki.
  • Derek is voiced by Yuri Lowenthal.
  • Derek made a cameo in Trauma Team, yet he was shown only from the back. His old friend, Gabriel Cunningham, consulted him about the mutated Rosalia Virus colony inside Naomi Kimishima's heart, and he advised CR-S01 on how to remove the colony. His voice is also heard in Naomi's flashbacks, where he informs her that she has a genetic disease and will likely die within a few months' time.
  • A poster with Angie in a bikini can be barely seen on Derek's bulletin board in his apartment.
  • Derek apparently has a crush on Angie Thompson, though this is never directly stated. It is heavily implied, however, as he considers her his "loved one" at the end of Under the Knife 2.

Gallery Edit

    vde Trauma Center series
Games Under the KnifeSecond OpinionNew BloodUnder the Knife 2Trauma Team
Characters Derek StilesAngie ThompsonNaomi KimishimaMarkus VaughnValerie BlaylockElena SalazarCR-S01Maria TorresHank FreebirdTomoe TachibanaGabriel Cunningham
Fields SurgeryFirst ResponseOrthopedicsEndoscopyDiagnosisForensics
Organizations Caduceus InternationalDelphiEidoth PharmaceuticalsHumaniParnassusAcropolis PharmaceuticalHands of AsclepiusResurgam First CareCumberland Institute of Forensic Medicine
GUILT KyriakiDefteraTritiTetartiPemptiParaskeviSavatoBlissPGS
Stigma CheirSomaOpsOnyxBrachionCardia
Neo-GUILT NousBythosSigeAletheia
Other Rosalia Virus

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