Grudge Keeper (flaw)
You have an over developed sense of vengeance!
Effect: If you're damaged in combat, you suffer a -2 penalty on attack rolls, skill checks, saving throws, and ability checks until you damage the foe that caused you harm. The penalty doesn't apply if you can't determine the damage's source. The penalty disappears when the combat ends if you do not otherwise harm the damage dealer.
Elven Pride of Arms (flaw)
You're a snooty elf who only uses their race's weaponry.
Prereq: elven blood
Effect: you suffer a -4 penalty on attack rolls with all manufactured and natural weapons, unarmed strikes, spells, and melee and ranged touch attacks except: longswords, rapiers and bows.
Fussy (flaw)
You're a fussy eater, and are uncomfortable ingesting anything but a small range of preferred foods and drinks. (The flaw doesn't specify which foods. You need to determine it yourself).
Effect: You become sickened upon ingesting any potion, and remain so until the diration of the potion expires. For instantaneous duration effects, you are sickened for a number of minutes eual to the caster level of the potion. You also suffer a -4 penalty on saving throws against ingested poisons.
As for the Forlorn/ Loner question, once you've taken one of the flaws, you can no longer take the other. Both flaws require you to have the ability to summon a familiar, so once you've taken one... you are ineligible for the second flaw.