addict,
freak,
junkie,
junky,
nut someone who is physiologically dependent on a substance; abrupt deprivation of the substance produces withdrawal symptoms
backslapper someone who demonstrates enthusiastic or excessive cordiality
fanatic,
fiend a person motivated by irrational enthusiasm (as for a cause); "A fanatic is one who can't change his mind and won't change the subject"--Winston Churchill
gadgeteer a person who delights in designing or building or using gadgets
partisan -
Adherent to a party or faction; especially, having the character of blind, passionate, or unreasonable adherence to a party; as, blinded by partisan zeal.
partisan -
Devoted to or biased in support of a party, group, or cause: partisan politics.
OmegaWiki Dictionary
Ω
partisan A soldier in a small independent group fighting against the government or regular forces by surprise raids.