how is he depicted in the sikh community?
The story of Hanuman as a "siddha" has been influential in Sikhism. Hanuman was an inspiration and object of reverence by the Khalsa. Guru Gobind Singh was a fond reader of the "Hanuman Natak" text.
Hanuman
In Sikhism, the Hindu god Rama has been referred to as Sri Ram Chandar, and the story of Hanuman as a "siddha" has been influential. After the birth of the martial Sikh Khalsa movement in 1699, during the 18th and 19th centuries, Hanuman was an inspiration and object of reverence by the Khalsa. Some Khalsa regiments brought along the Hanuman image to the battleground. The Sikh texts such as "Hanuman Natak" composed by Hirda Ram Bhalla, and "Das Gur Katha" by Kavi Kankan describe the heroic deeds of Hanuman. According to Louis Fenech, the Sikh tradition states that Guru Gobind Singh was a fond reader of the "Hanuman Natak" text.

During the colonial era, in Sikh seminaries in what is now Pakistan, Sikh teachers were called "bhai", and they were required to study the "Hanuman Natak", the Hanuman story containing "Ramcharitmanas" and other texts, all of which were available in Gurmukhi script.
who is monkey king in the ramayana who helps save sita Hanuman who is "trijata"? She is a rakshasi (demoness) in the "Ramayana" who is assigned the duty of guarding Sita who was kidnapped by king of Lanka Ravana. rijata is describe as a daughter of Vibhishana. does she have any other name? Yes - Punukay, Benyakai, Devi Seri Jali can you describe who is the monkey king mentioned earlier? A Hindu god and divine vanara companion of the god Rama. which epic is he a character of? Ramayana, Mahabharata how is he a part in buddhism? Hanuman appears with a Buddhist gloss in Tibetan and Khotanese versions of Ramayana.  In Chinese Buddhist texts, states Arthur Cotterall, myths mention the meeting of the Buddha with Hanuman, as well as Hanuman's great triumphs. are there any festivals related to him? Yes - Ramlila did he have a family? UNANSWERABLE are there any movies made on his story? Yes - Bajrangbali, a 2005 animated film 'Hanuman' is he mentioned in any other texts or scriptures? Yes - Jain texts such as 'Uttarapurana' and 'Anjana-Pavananjaya'; The Sikh texts such as 'Hanuman Natak'; the Thai "Ramakien." what is the "hanuman chalisa"? Indian poet Tulsidas wrote "Hanuman Chalisa", a devotional song dedicated to Hanuman. He claimed to have visions where he met face to face with Hanuman.
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Hanuman [SEP] Sikhism
In Sikhism, the Hindu god Rama has been referred to as Sri Ram Chandar, and the story of Hanuman as a "siddha" has been influential. After the birth of the martial Sikh Khalsa movement in 1699, during the 18th and 19th centuries, Hanuman was an inspiration and object of reverence by the Khalsa. Some Khalsa regiments brought along the Hanuman image to the battleground. The Sikh texts such as "Hanuman Natak" composed by Hirda Ram Bhalla, and "Das Gur Katha" by Kavi Kankan describe the heroic deeds of Hanuman. According to Louis Fenech, the Sikh tradition states that Guru Gobind Singh was a fond reader of the "Hanuman Natak" text.