What's the goal here, nonsi? Are you planning a particular class, feat, NPC...? For example:
In a past life you were a great hero, and you've been sent back by the gods in a new mortal shell in a time of great need.
Must be selected at character creation.
Choose an archetype (see below). You gain the associated benefits.
Archetype Benefits Trickster You gain a +2 bonus on all Charisma-, Dexterity-, and Intelligence-based skills and may use those skills untrained. Spellcaster +1 caster level (for all spellcasting classes you take). Warrior Gain 2 bonus [Fighter] feats for which you meet the prerequisites. You may select feats requiring BAB +1 for this purpose.
You died in battle, but have been granted a reprieve by the gods - by restoring you to life as a child.
Must have died and been brought back to life by the reincarnate spell.
You are restored to life as if by true resurrection, with the following changes:
Your size is reduced to one size smaller than the standard size for an adult of your race.
You gain a -2 size penalty to your Strength score and a +2 size bonus to your Dexterity score.
Your age category is reduced to "juvenile" (one-half the minimum age for adulthood for your race). It is assumed that you were a normal child with only vague recollections of your past life before you reached this age.
You age normally from your new age. Once you reach the minimum age for an adult of your race your size increases one step and you ignore all the ability modifiers described above.
The effects of this feat supersede the effects of the reincarnate spell, though you may choose to be restored to life as a member of any LA+0 humanoid race (at the DM's option).
You may choose to gain this feat as a bonus feat when you die (at the DM's option). If you do, you may ignore the feat prerequisites and you forfeit the next feat to which you would otherwise be entitled.