Here's a semi-gestalt template, that encourages multiclassing (you benefit from the experience of your past life even if you've chosen an entirely different career path).

Can still be tailored -for example the Spellcaster archetype might grant Magical Aptitude and/or Practiced Spellcaster as bonus feats, and all reincarnated legends could gain a Defense Bonus or other variant rule benefit.

Reincarnated Legend
You have returned from the afterlife in a new mortal shell.

Prerequisites
Must be selected at character creation.

Benefits
You gain the reincarnated legend template.

Special
At the DM's option, your level adjustment from the Reincarnated Legend template may be waived or increased.

Reincarnated Legend
Some mortal heroes achieve such greatness in life that they draw the attention of the gods themselves. After death, these heroes are sometimes reincarnated in new mortal vessels to serve the inscrutable aims of their deities - whether to save a kingdom in a time of great need or to bring about a new age of darkness. These "reincarnated legends" generally begin their new campaigns as adolescents who have spontaneously regained memories of thir past life.

A reincarnated legend appears just as a standard juvenile of their current race (which may differ from their race in their past life), save that they often have an self-assurance that belies their age.

Reincarnated legends gain the racial language (Common for humans) of their past life as a bonus language.

Creating A Reincarnated Legend
"Reincarnated legend" is an inherited template that can be added to any humanoid with the Reincarnated Legend feat (referred to hereafter as the base creature).

A reincarnated legend has all the base creature’s statistics and special abilities except as noted here.

Size and Type
Many reincarnated legends have the Youth special quality (see below). Otherwise unchanged.

Hit Dice
See the relevant Archetype special quality.

Attacks and Damage
See the relevant Archetype special quality.

Special Qualities
A reincarnated legend retains all the base creature’s special qualities and gains one of the Archetype special qualities described below. The reincarnated legend may also gain the Youth special quality, at the DM's option.

Archetype (Spellcaster) (Ex)
The reincarnated legend was a spellcaster in her past life. She gains the following benefits:

A +1 inherent bonus to one of her mental ability scores. This bonus increases by +1 at 5th level and every five levels thereafter (to a maximum of +5 at 20th level).

Her base Will save increases to one-half her character level +2.

Concentration, Knowledge (all skills), and Spellcraft are always considered class skills for her and she may use them untrained. She gains a +2 racial bonus on these skills.

Her caster level for her highest-level spellcasting class increases to equal her character level +2.

Archetype (Trickster) (Ex)
The reincarnated legend was a guileful hero in her past life. She gains the following benefits:

A +1 inherent bonus to her Charisma, Dexterity, or Intelligence score. This bonus increases by +1 at 5th level and every five levels thereafter (to a maximum of +5 at 20th level).

Her base Reflex save increases to one-half her character level +2.

All Charisma-, Dexterity-, and Intelligence-based checks are considered class skills for her and she may use them untrained. She may always take 10 on these skills, even if rushed or threatened.

Each of her Hit Dice increases one step (to a maximum of d6).

2 additional skill points per level (to a maximum of 8, not including her Intelligence bonus), with quadruple skill points at first level.

Archetype (Warrior) (Ex)
The reincarnated legend was a guileful hero in her past life. She gains the following benefits:

A +1 inherent bonus to one of her physical ability scores. This bonus increases by +1 at 5th level and every five levels thereafter (to a maximum of +5 at 20th level).

Her base Fortitude save increases to one-half her character level +2.

Ride and all Strength-based checks are considered class skills for her and she may use them untrained. She gains a bonus on these skills equal to one-half her character level.

Each of her Hit Dice increases one step (to a maximum of d10).

Her base attack bonus increases to three-quarters of her character level. If it was already at least three-quarters of her character level, it instead increases to equal her character level.

Proficiency with all simple and martial weapons, all types of armour, and with shields (including tower shields).

Youth (Ex)
The reincarnated legend begins play in the age category of "juvenile" (one-half the minimum age for adulthood for her race). It is assumed that she was a normal child with only vague recollections of her past life before she reached this age. Her size category is reduced by one step. She gains a -2 size penalty to her Strength score and a +2 size bonus to her Dexterity score. A reincarnated legend who reaches the minimum age for adulthood for her race loses this special quality.

Abilities
See the relevant Archetype special quality.

Skills
See the relevant Archetype special quality.

Feats
See the relevant Archetype special quality.

Organization
As base creature, though reincarnated legends often rise to command armies for righteous (or unholy) causes.

Challenge Rating
Same as the base creature.

Treasure
As base creature.

Alignment
As base creature.

Advancement
By character class.

Level Adjustment
Same as the base creature +1.