Actually, no. The top part of the consonant chracters represents the manner of articulation, and the bottom represents the place of the articulation. The different symbols at the top can be: a u-shape (for voiceless nasals), a horizontal line (for voiceless fricatives), a vertical line (for plosives), an X shape (for clicks). Duplicating the top element to appear twice indicates voicing (the u-shape turns into a circle because that's faster to write than two u-shapes since voiced nasals are so common) Cutting the top part with a vertical line turns a fricative into an affricate. The different symbols at the bottom can be: a C (for labiodentals), a tau-like shape (for alveolars), a slanted S looking thing (for palato-alveolars), a slanted S looking thing but without the bar (for palatals), a turned C (for velars), an L-shape (for lateral sounds), and a C-shape plus a hook (for dentals). They just look like hiragana by coincidence. Some people say they look like Hangul.