All the characters are 25 pts point based 7 level Tieflings with rare heritage.
Please take time to look at the alternate Tielfling heritages on the OGL databases where you will get all the info on the spell ability replacement and the bonus skills.
To be clear, you chose one of the variant tiefling heritage, the Tiefling Racial Skill Bonuses will be replaced by the alternate skill bonus, the tiefling Spell-Like Ability (darkness 1/day) will be replaced by the Alternate Spell-Like Ability.
As a bonus, you can make two rolls on the Variant Tiefling Abilities table and select a single bonus ability. This is in addition to the alternate tiefling heritage.
All the characters must have a good alignment.
Class wise, all the standard classes/archetypes are allowed (PFRPG core, APG, UM and UC). However, there are no firearms so no gunslingers/gunbased characters and no oriental classes (no samurai or ninja).
Each character can have two traits from any Paizo source.
No 3PP race, class, feat or trait.