I've read the thread, so I hope I'm not just adding a "yes, me too!" response, actually I dont believe I am, but that was the modest introductions.
FIRST, chan, kun, san, sama, senpai, etc--- are NEVER to be used when refering to oneself. Sometimes you'll see someone calling themself, something-chan, etc etc... these terms are only to be used for people refering to others.
chan - small, cute, tiny... for examp,e aka~chan is a baby, because baby has red flush skin and are tiny and cute, hence aka chan... also for girls, or for effeminite men (Kaba-chan).... etc... mostly...
san - pretty safe standard respectful term mr/mrs
kun - mostly for male office workers, Tanaka-kun (name of a character from a famous manga)...
senpai - in school, or otherwise, mostly for male big-brother like superiors who show around new school members, team members etc...
sama - for very respectful elderly, honorofic or otherwise, ojisama (grandfather), ojiisama (prince)...
oyaji - used to be polite term, now term for old useless men
otaku - previous polite *I* pronoun, now derogatory--- mostly see folowing---
boku - more manly, I'd say mostly used by boys, and men
watakushi - I, male or female, longer term
watashi - same as above, but perfered by many for being shorter
atashi - I, used by girls to be cute, or femminine...
ore - used by men, boys, and characters in manga trying to be tough
kimi - you, familiar term that is edearing, very personal, see "kimi wa petto", "you are my pet"--
anata - you, mostly used by females (though it can also be used by males), to address their husbands.