25 days ago - AndrewT - Direct link
It's hard to see how it's possible that only part of a DLC works, it should be all or nothing. But you don't give much detail about what exactly you believe is missing and how you are checking for that.

You may as well try a full **clean** re-install:

- move any valued save games elsewhere, and user_empire_designs.txt from /Documents/Paradox Interactive/Stellaris/ if you have made any custom empires or races.
- "uninstall" in Steam-Stellaris
- manually delete both the Steam/SteamApps/common/Stellaris AND Documents/Paradox/Stellaris folders
- re-install game in Steam, run a Steam Verify when done.
- add stellaris.exe to the exceptions list of your antivirus app; ESPECIALLY if you have Windows Defender, add it to the Ransomware "Apps Allowed Through" list.
- start the game with no mods active and test

In particular you need to make sure there are no files or folders left under either the Steam Stellaris or Documents Stellaris locations, before installing again.

If that doesn't help, please clarify what you believe is missing and how you are checking that, thanks.  
25 days ago - AndrewT - Direct link
You see portraits from a DLC you don't have, but not ones from a DLC you do have? It's ... hard to see how that is possible! Are you sure you don't have them mixed up? You can see them next to each other here:

Species - Stellaris Wiki

stellaris.paradoxwikis.com stellaris.paradoxwikis.com
This is all in the "Appearance" part of building a new empire, right?  

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about 22 hours ago - AndrewT
about 22 hours ago - AndrewT

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Species - Stellaris Wiki
Every habitable planet has the potential of developing different kinds of intelligent beings that may, naturally or not, develop technologically. Sometimes, such beings reach a crucial point in their development that allows them access to FTL technology and, as a consequence, the ability to become full-fledged interstellar empires.