Indonesian honorifics
Indonesian honorifics are honorific titles or prefixes used in Indonesia covering formal and informal social, commercial relationships. Family pronouns addressing siblings are used also in informal settings and are usually gender-neutral. Pronouns vary by region/ethnic area and depend on the ethnic group of the person spoken to. In addition to being gender- and ethnic-based, pronouns are often seniority-based and even profession-based. Properly addressing people in Indonesian is important and learnt from an early age. It is common and expected to call people using a pronoun and their first name. Royalty. Indonesian royalties use  the title "Sri" and "Prabhu" to address the names of kings and monarchs, usually in Indianized kingdoms which had Hindu/Buddhist influence located in the islands of Sumatra, Java, Bali, Borneo, and other places. "Sri Baginda" or "Sri Paduka Baginda" is the formal title used to address a king, for example the king of Yogyakarta, Sri Sultan Hamengkubuwono X. "Prabhu" is also the title used for kings who ruled Indonesia in the Hindu/Buddhist era, such as Prabu Siliwangi and Prabu Bratasena. Usage. Adult men are addressed by Bapak (short Pak) and adult women by Ibu (short Bu). This can  be translated to Mr. and Mrs. but can also mean Father/Mother. It can be used in conjunction with their first name or full name. Important to note, Indonesian pronouns can all be used in second and third-person singular and even in first-person. Example by case: An informal way to address a significantly older person is to use "Om", "Paman", "Bibi" or "Tante", which mean "uncle" and "aunt". The terms "Om" and "Tante" are Dutch-influenced and quite commonly used in the big cities. Indonesian like to speak in an short and effective way so when speaking to  someone, omitting the pronoun completely is common (unlike in English). "Kapan tiba di Jakarta?" (lit. when do [you] arrive in Jakarta). Reflective Pronoun. Indonesian speakers use enclitic pronouns -"ku" (1 SG), -"mu" (2 SG), and -"nya" (3 SG). The latter may also be used as a polite form for the second person singular. "Siapa namanya?" (What is your name, lit. what is their name). By local language. Malay. In Malay speaking regions, such as Sumatra, some regions of coastal Borneo, and Jakarta, "abang" is for "older brother" and "kakak" is for "older sister". In Betawi language (used by the Betawi  people of Jakarta), "mpok" is for "older sister" and is only used to address a Betawi female. Javanese. In Javanese and broadly speaking in Java, "Mbak" is used for "older sister" and "Mas" is used for "older brother". "Mas" and "Mbak" is also used as formal honorifics for men & women in Java generally. Sundanese. In Sundanese, i.e. in Bandung, "Akang" or "A'a" is used for older brother and "Teteh (Tétéh)" for older sister. Madurese. In Madurese language, younger brother/sister can be called as "Ale" and for older brother is "Chachak" and for older sister is the same with Javanese  which is "Mbak". Balinese. In Balinese, older (relative to the speaker) people are addressed as "Bli" (for "brother") and "Mbok" (for "sister") Papuan. In Papua, men are addressed by "Pace", women by "Mace" (older woman) or "Usi" (older sister). Uncles and aunts are addressed relative to the parents age, "Bapak muda, Bapak tua, Mama muda, Mama tua" (younger uncle, older uncle, younger aunt, older aunt respectively). Hokkien. In the Chinese Indonesian diaspora, "Chichi" is used to address for "older sister", "Koko" is used for "older brother".