It was devised by Mohammed Turay, an Islamic scholar, at a town called Maka. One of Turay's Quranic students was a young man named Kisimi Kamara. Kamara was the grandson of Turay's sister. Kamara also married Turay's daughter, Mariama. Turay devised a form of writing called 'Mende Abajada', which was inspired in part by the Arabic abjad and in part by the Vai syllabary. Some scholars have also suggested that some of the characters were inspired by certain indigenous Mende pictograms and cryptographic characters that are widely known to the Mende people. Turay's "Mende Abajada" was adjusted a bit by Kamara and probably corresponds to the first 42 characters of the script, which is an abugida. Kamara developed the script further with help from his brothers, adding more than 150 other syllabic characters. Kamara then popularized the script and gained quite a following as result—which he used to help establish himself as one of the most important chiefs in southern Sierra Leone during his time. Kikakui is still used today, but perhaps by less than 500 people. There is also an associated number writing system, which is entirely original.
Characters
There were an original 42 syllabic characters that were ordered according to sound and shape, while 150 more characters were later added without the same consistency to the character set. Some of the initial 42 characters resemble an abugida, given the standard ability for a reader to discern the vowels from seeing the character, as indicated by dots in consistent locations, but such uniformity vanishes in the remaining 150 characters. Glyphic variants have been found for certain characters. Additionally, digits are encoded by indicating the place value on each digit for a number, with the units digit alone having no special indication. Beyond the 10s digit, the further digits are written on top of the base place value indicator, which increases in vertical lines from 2 at the 100s place to the millionths digit that is encoded. All of the different possible digits are encoded separately.