This build will allow you to:

• create an unarmed monster capable of one-shotting most enemies.
  
• have a huge amount of skills to persuade everyone and fully upgrade T3-M4 and HK 47.
  
• combine Sith Assassin's Sneak Attack ability with light-sided Force Enlightenment so you have best of both sides.

Strength - 18 (and all others level-up points here)
Dexterity - 8
Constitution - 14 (we need at least some decent implants)
Intelligence - 14 (to cover all skill-based elements; we don't really need anything except Strength for this unarmed build so it's time for role-playing).
Widsom - 8 (only defensive buffs for main characters... and Force Storm, yes).
Charisma - 10 (a little help for persuasion).

Class - Jedi Sentinel. A lot of skill points for our stealth assassin to hide, deceive, hack and pick the locks. In the endgame you'll be a real jack-of-all-trades.


Prestige class - Sith Assassin. Sneak Attack for dark side is much better than Watchman's. But one doesn't simply reject Force Enlightenment. Therefore we must do enough crap before prestige class and then suddenly become a good guy. You can see how much crap is enough on the screenshot to obtain a prestige class.

Feats:

Master Flurry - our main and only attack.
Master Dueling +3 to attack and defense unarmed.
Master Dual Strke +6 to attack when attacking an enemy that another party member is also attacking. Take this before prestige class.
Stealth Run speaks for itself.


Powers:

Force Storm. The only attacking power that need for any build. Useful for large concentration of enemies.
Master Heal. Vital.
Master Valor +5 to all stats and saving throws.
Master Speed ​​+4 defense and +2 attacks per round.
Force Enlightenment - an ability obtained by the end of the game for the light side. Launches current version of Valor, Speed and Armor with one click.
Master Battle Meditation +4 to party attack and damage, -4 to enemies' attack and damage.
Force Redirection - reflect shots with bare hands. Not only beautiful but also very useful for such type of a character.

Of course we an equipment with Strength and damage bonuses. I found this:

• Lightning Gloves - Damage Bonus: +2-12 Electrical, Attack Modifier: +1 when unarmed. Best gloves for this character.
  
• CNS Strength Enhancer +4 Strength.
  
• Physical Boost Implant. Constitution +1, Dexterity +2, Strength +2.

Strong Advice: Kreia (and then Visas) with high Wisdom should be your bodyguard. If something goes wrong Insanity or Destroy Droid will make your enemies harmless and save your time.

You'll get this character:

I played with Restored Content Modification, but it shouldn't matter much for this build. Have fun!

Dexterity-focused unarmed build, which allows to create an invulnerable character:
https://cs2bus.com/sharedfiles/filedetails/?id=2850653292

More hardcore version of the build for the first game:
https://cs2bus.com/sharedfiles/filedetails/?id=3151436667