Extremely low FPS running XCOM 2

After getting your squad together, if you rename your squad member in the customization settings, if you change the name to a specific name the game will make it a "special" XCOM hero. There are two others you can get as XCOM heroes, all discovered through the default.ini configuration settings:

 ;SUPER SOLDIERS!! 
 ;Sid Meier BodyPartTemplateConfig=(PartType="Head",
 TemplateName="Supersoldier1_M",
 ArchetypeName="Head_Supersoldier1.ARC_Head_Supersoldier1",
 Gender=eGender_Male, Race=eRace_Caucasian, SpecializedType=true)
 ;Beaglerush BodyPartTemplateConfig=(PartType="Head",
 TemplateName="Supersoldier2_M",
 ArchetypeName="Head_Supersoldier2.ARC_Head_Supersoldier2",
 Gender=eGender_Male, SpecializedType=true) ;VanDoorn
 BodyPartTemplateConfig=(PartType="Head",
 TemplateName="Supersoldier3_M",
 ArchetypeName="Head_Supersoldier3.ARC_Head_Supersoldier3",
 Gender=eGender_Male, SpecializedType=true)

So basically, you just need to rename your squad member to either:

• Peter Van Doorn
• Sid Meier
• Beaglerush

In order to get an XCOM hero!

For reference, Peter Van Doorn is a famous NPC you can rescue in XCOM: Enemy Unknown.. Sid Meier is a famous developer who is the creator of the Civilization series and director of Creative Development for Firaxis Games. Beaglerush is a famous XCOM streamer and youtuber.

No, you can't. The only thing you can do in the Living Quarters screen is to view what soldiers you have, the scientists you have, and the engineers you have.

The only way to customize your soldiers is, like you said, either from the Armory or in the mission deploy screen. You can't customize engineers and scientists.