Codes have been in the history of LEGO games since ages, and therefore, we also find them again in this masterpiece.
This is a list of every code that I found in the deeps of the webs. Every code was tested ingame and DOES work.
I appreciate every comment about additions, or maybe my grammar mistakes.

First of all you may ask yourself: How do I even redeem all those codes?
There's in fact, two ways that I know of: The ESC menu and the ingame menu.
In both, the ESC menu and the ingame menu, you must scroll to the very right of it, until you find a choosable box with the text "Redeem Code". Simply press on it, and enter the codes that you'd like to redeem.

The current list of ingame codes consist of:

• A) Codes for characters, which you can unlock via their codes but also ingame via playing.
  
• B) Codes for characters, which you can only unlock via codes.
  
• C) Codes for vehicles.

The list is build up like this:
CODE - CHARACTER

• KH7P320 - Aayla Secura
  
• XV4WND9 - Admiral Holdo
  
• OKV7TLR - Dengar
  
• 3FCPPVX - Tarkin
  
• SIDIOUS - Imperator Palpatine
  
• BAC1CKP - Mister Bones
  
• WBFE4GO - Nute Gunray
  
• Z55T8CQ - Poggle The Lesser
  
• GR2VBXF - Ratts Tyerell
  
• VT1LFNH - Shaak Ti
  
• T9LM1QF - Shmi Skywalker
  
• SKYSAGA - Snap Wexley

• C3PHOHO - C-3PO (Holiday Special)
  
• WROSHYR - Darth Vader (Holiday Special)
  
• TIPYIPS - D-O (Holiday Special)
  
• LIFEDAY - Gonk Droid (Holiday Special)
  
• KORDOKU - Poe Dameron (Holiday Special)
  
• WOOKIEE - Wookie (Holiday Special)

• ARVALA7 - Razor Crest
  
• SHUTTLE - Resistance I-TS Transport (Galaxy's Edge Transport)