In this abugida, the vowels are put on top of the base consonants. The inherent vowel for the consonants is /a/.
This is an abugida I made for Toki Pona. Derived sitelen pona a - awen ja - jasima ka - kama la - la ma - mama na - nasin pa - palisa ta - taso wa - wan e - en i - ike o - ona u - uta (final) - pini/pake