According to Devaki nandan Khatri, An Aiyyar (male) or Aiyyara (female) is a secret agent cum spy cum fighter. He or she is expert in many arts like:
- Disguise
- Fighting skills
- Spying
- Science
- Fine arts
- Medical
- Chemistry
Disguise is must (Aiyyar/a may change him/herself into person of same or even of opposite sex but of resembling body built, by makeup).
Fighting skills are also must, for self-defence. An Aiyyar/a always overpowers any small group of ordinary soldiers.
He/she may need to spy for taking out some secrets or for finding some missing persons.
Knowledge of science and fine arts is also necessary, as it may come handy many times.
Medical knowledge, and specially that of Anaesthesia is needed for him/her.
Chemical knowledge is also needed
In a nutshell an Aiyyar is a Jack of all trades. But contrary to common belief, Khatrian Aiyyar/a are unfamiliar with magic and spells. He/she may join into any king's or landlord's service or may remain free.
The items must for an Aiyyar/a: Kamand (a long very strong cord used to climb over building secretly, or for tying opposite Aiyyar/a or captured person/s) Batua or purse (used to keep necessary medicines, makeup items, money and dry fruits) Lakhlakha must also be in the 'Batua' (lakhlakha is a kind of smelling salt used to revive any unconscious person) Khanjar or dagger (for safety and for attack) Langot or short smart pants are usually worn by male Aiyyars when in easy mood
Ethics of Aiyyars:
Never kill or torture any other Aiyyar/a (but can arrest him/her)
Never cheat your master
Never attack too many Aiyyars over a single person
( Source Wiki)
Any one knows more do add here