  We present results from the Very Long Baseline Array (VLBA) multi-frequency
(1.6, 4.4, 8.6, 22 GHz), high-sensitivity (~25 microJy beam^-1), sub-parsec
scale (<1 pc) observations and Spectral Energy Distributions (SEDs) for a
sample of 12 local active galactic nuclei (AGNs), a subset from our previous
volume-complete sample with hard X-ray (14-195 keV) luminosities above 10^42
erg s^-1, out to a distance of 40 Mpc. All 12 of the sources presented here
were detected in the C (4.4 GHz) and X (8.6 GHz) bands, 75% in the L band(1.6
GHz), and 50% in the K band (22 GHz). Most sources showed compact,
resolved/slightly resolved, central sub-parsec scale radio morphology, except a
few with extended outflow-like features. A couple of sources have an additional
component that may indicate the presence of a dual-core, single or double-sided
jet or a more intricate feature, such as radio emission resulting from
interaction with nearby ISM. The spectral slopes are mostly GHz-peaked or
curved, with a few showing steep, flat, or inverted spectra. We found that in
the sub-parsec scale, the GHz-peaked spectra belong to the low-accreting,
radio-loud AGNs with a tendency to produce strong outflows, possibly
small-scale jet, and/or have a coronal origin. In contrast, flat/inverted
spectra suggest compact radio emission from highly-accreting AGNs' central
region, possibly associated with radio-quiet AGNs producing winds/shocks or
nuclear star formation in the vicinity of black holes.
