Symbiote (or Sympath)
Prerequisites: None
25% damage to summoner is transferred to summoned creature (and vice versa).
Gatherer (there's probably a better name for it).
Prerequisites: Lucky 1
Incompatible with: Gold Digger
You are more likely to find ingredients, but you no longer find any equipment.
Gold Digger
Prerequisites: Lucky 1
Incompatible with: Gatherer
You are more likely to find gold, but you no longer find any ingredients.
Focused
Prerequisites: None
AOE spells are 50% more effective, but 50% less radius.
Nobody Has As Many Friends
Prerequisites: None
Attitude towards character is increased by 25 points when gifting cheese.
Symbiote: I had a very similar idea in the OP. The problem is people starting combat with a summon and then keeping the summon alive but not in the battle. It would need a redesign to fix this problem, and I think it's something Soul Harvest already does better anyway.
Gatherer/Golddigger: One of the things you can't Lucky Find, actually, is ingredients. It never happens on any rank of Lucky Charm; just arrows, scrolls, gold, finery (ex: golden cups), and gear. As such, the ingredient focus of these talents feels very out-of-place.
Focused: The game has far more area spells than you might think. Every single spell which can target ground or clouds for an effect is an area spell, even if the area is so small that it can normally only affect one enemy -- Blitz Bolt, Magical Poison Dart, and Flare are all area spells. This talent would be far too good for those, since the reduced area wouldn't be much of a drawback. I don't think there's any good way to make a talent which reduces radius as a drawback, although you might be able to make a decent talent from one which reduces range as a drawback (requiring you to be closer to enemies).
Nobody Has As Many Friends: Decent joke. Horrible talent.
Head Start
Gain +5 starting AP.
Inconspicuous
Gain +40% chance to evade Attacks of Opportunity.
Warlock
Each rank of Aerothurge/Pyrokinetics/Geomancy/Hydrosophist/Witchcraft increases your weapon attack damage by 4%.
Iron Fist
Unarmed attacks have an 80% chance to Stun.
Introvert
Removes the modifiers from personality Traits, but grants +1 Ability point per level.
Head Start: This is equivalent to +10 Perception for the purpose of starting AP. Way, way, way too powerful. +1 starting AP (equivalent of 2 Perc for casters who don't benefit from the crit chance or other aspects of Perc) would be the appropriate power level. Remember that the default for a talent would be +1 to an attribute, so a limited-utility +2 to an attribute is a fine talent.
Inconspicuous: Interesting. Not really sure how much of a bonus against attacks of opportunity this should provide. One could make the argument for removing the chance completely; one talent gives you the chance to make attacks of opportunity, another talent cancels out the first talent. I'd prefer that, because it would also mean those characters couldn't "soak" attacks of opportunity with a talent called Inconspicuous; AoOs are limited to one per round, so you might want or not want tanking. There's definitely a potential talent in here somewhere.
Warlock: Really don't like this one. Spellcasting abilities are good enough as is.
Iron Fist: Actually hideously overpowered. I don't know how much unarmed fighting you've tried, but unarmed costs 2AP per instance, and each instance delivers 3 blows (might be different holding a shield, haven't tried). With an 80% chance to stun, what that works out to is a 2AP ability with 0 cooldown and a 99.2% chance to stun and a much better chance at getting through Willpower saves. Compare that to perfectly usable skills such as Shocking/Freezing/Petrifying Touch.
Introvert: Another very OP suggestion. An extra point per level is most like 20 ability points. It takes 5 ability points to take a skill from rank 4 to rank 5 (assuming no ability-boosting gear is involved). There are essentially zero instances where a player can line up 4 different abilities to go from rank 4 to rank 5 off of traits, which would be a 20-point equivalent. Remember that the baseline for a talent is to give 2 ability points (All Skilled Up), so in order to justify a talent which gives 20 ability points, you need to take away 18 ability points worth of goodness, and traits, while nice, just aren't worth quite that much. Plus, +1 ability point per level is already a Lone Wolf thing.
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Adding a fixed version of Head Start to second post in this thread (for some reason it won't let me edit the OP anymore).