Time to look back on your day.

Reflection Feat 7

General

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Spending a bit of time looking back can make you better. Before a rest, you can spend 30 minutes to review the day. Choose a die roll you failed at the day before. After your rest, when you attempt that same roll, you can choose to gain a +1 circumstance bonus to that roll. You can do this a number of times equal to your intelligence modifier, minimum 1.

Thoughts?

Had a blast playing with the family and this idea come up.

Fortuitous Harm Feat 7

General

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When you roll damage for a weapon attack using a rune to add damage dice and at least two dice show the same number, roll an additional damage die and add it to the total.

More fun right out of the gate.

Starting Line Feat 1

General

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If you hit hard enough in round one, there is no round two. You gain a +2 circumstance bonus to attack rolls and skill checks in your first round of combat. This starts at the start of your turn and end at the end of your turn.

Thoughts?

Ok, one list luck feat-now for Pathfinder 2nd Ed!

Lucky Charm Feat 1

General

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You always are a boon to those around you! When you or another creature within 30 feet of you spend an hero point, that reroll gains a +2 status bonus.

Thoughts?

Here is one from my family group.

Carry Through Feat 1

General

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When you attack an enemy you have already attacked and hit before with a weapon with the sweep property, you gain a +1 circumstance bonus to your attack roll to attack that enemy again this turn.

Thoughts?

I want to splash lots of damage around in Pathfinder.

Splash Critical Feat 4

General
When you hit your target, every around feels it! When you critically hit a target and the weapon does splash damage and effects, treat the splash damage and effects as if it was a critical hit for modifying damages and effects, typically doubling the damage. Other feats, abilities, and items that modify critical hits and effects are applied to splash damage and effects as well

thoughts?

Time to learn by getting hit!

Learn By Experience Feat 3

General
You learn best by doing or taking the hit. Three times per day, when you have to make a saving throw or a flat check against an effect or spell that you already had to make a save or flat check against, you can reroll taking the second result.

Thoughts?

How about this for a feat to deal with some splash damage?

Splash Dodge Feat 7

General

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You get used to dodging the collateral damage of most things. When you are subject to splash damage, you may make a Reflex saving throw to negate the damage. The DC is equal to the original effect or if no save is available, it is equal to the class saving throw of the person causing the effect or 10 + the CR of the creature or item level.

Thoughts?