This is developed for my campaign: Quest Against Destiny (feel free to use)

Campaign Lore:

You are one of the ten souls brought back from the glimpse of death by the combined power of three divine entities.
Mystra, Kelemvor and Oghma saw in you the spark that makes heroes and they are in dire need of help.

Therefore, you awoken anew in Faerûn, a world governed by gods, magic and monsters. Since as a soul you can’t do much, you’ll be given the body of a freshly fallen adventurer. For you as for him/her, it is a new chance for a second life but this one will not be as easy as you thought. Indeed, you’ve been tasked to accomplish what even the deities cannot, bring back the Stylus of Destiny to the realm of the gods. 

 

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Background :

 In your previous life, you were a soldier from an elite squad. At the peaks of your physical condition, the army taught you how to survive in the most dangerous places of the world.

Death is a common thing on the battlefields and a single bullet is sometimes enough to get rid of the mightiest fighter. A lucky sniper shoot, A clean hit and not even a second to feel the pain.

To help you in your quest Oghma shaped your past life experiences into asset for this world to use.

Skill Proficiencies: Survival, and one of your choice between Athletics,Acrobatics.

Tool Proficiencies: Two tools of your choice.

Equipment: Since you are just a soul brought from another world, you have no equipment.

Suggested Characteristics

With this background the soul is from our world but the body is from Faerûn. So I recommend to chose one aspect from the list down here and one of your choosing.
This will represent the duality between the soul from our science-based world and the other which represent your class.

d8	Personality Trait
1	I hate being late so I plan everything.
2	I am always smiling and I like to learn about the other.
3	I prefer action over talk.
4	I tell dad jokes when there is a moment of silence.
5	I keep doing my daily exercises in the morning to stay fit.
6	I don't talk unless it's necessary.
7	I am homesick and talk about it as soon as I have the opportunity.
8	I take pride in my looks.

d6	Ideal
1	Respecting and caring for each other is what makes us strong. (Good)
2	Nobody build a empire without breaking some eggs on his path. And personally I don't mind. (Evil)
3	Following blindly the rules is for the narrow minded people. I prefer bending them my way. (Chaotic)
4	If there is rules there is a reason for it. So I follow them. (Lawful)
5	The end justifies the means. (Neutral)
6	My goal it to live this new life to the fullest. (Any)

d8	Flaw
1	I have a goldfish memory. I always forgot the little thing.
2	I don't need much to start a fight.
3	I love alcohol but alcohol don't love me.
4	I judge people too quickly and unfairly more than often.
5	If holding grudges was an Olympic sport, I would be a gold medal.
6	I always complain when thing don't go my way.
7	When I'm in trouble it's never my fault but the others.
8	I'm a pathological liar.