  In this paper we study a set of twelve pulsars that previously had not been
characterized. Our timing shows that eleven of them are "normal" isolated
pulsars, with rotation periods between 0.22 and 2.65 s, characteristic ages
between 0.25 Myr and 0.63 Gyr, and estimated magnetic fields ranging from 0.05
to 3.8x 10^{12} G. The youngest pulsar in our sample, PSR~J0627+0706, is
located near the Monoceros supernova remnant (SNR G205.5+0.5), but it is not
the pulsar most likely to be associated with it. We also confirmed the
existence of a candidate from an early Arecibo survey, PSR~J2053+1718, its
subsequent timing and polarimetry are also presented here. It is an isolated
pulsar with a spin period of 119 ms, a relatively small magnetic field of
5.8x10^9 G and a characteristic age of 6.7 Gyr; this suggests the pulsar was
mildly recycled by accretion from a companion star which became unbound when
that companion became a supernova. We report the results of single-pulse and
average Arecibo polarimetry at both 327 and 1400 MHz aimed at understanding the
basic emission properties and beaming geometry of these pulsars. Three of them
(PSRs~J0943+2253, J1935+1159 and J2050+1259) have strong nulls and sporadic
radio emission, several others exhibit interpulses (PSRs J0627+0706 and
J0927+2345) and one shows regular drifting subpulses (J1404+1159).
