This is the error log I get from the Batarians

Failed to find any textures at Things/Race/Batarian/HeadBase/ while constructing Multi(initPath=Things/Race/Batarian/HeadBase/, color=RGBA(0.949, 0.929, 0.878, 1.000), colorTwo=RGBA(0.000, 0.000, 0.000, 0.000))
UnityEngine.StackTraceUtility:ExtractStackTrace ()
(wrapper dynamic-method) Verse.Log:Verse.Log.Error_Patch1 (string)
Verse.Graphic_Multi:Init (Verse.GraphicRequest)
Verse.GraphicDatabase:GetInner<Verse.Graphic_Multi> (Verse.GraphicRequest)
AlienRace.HarmonyPatches:ResolveAllGraphicsPrefix (Verse.PawnGraphicSet)
(wrapper dynamic-method) Verse.PawnGraphicSet:Verse.PawnGraphicSet.ResolveAllGraphics_Patch5 (Verse.PawnGraphicSet)
f:b (Verse.Pawn)
f:a (Verse.Pawn,bool)
f:c (Verse.Pawn)
a2:a (Verse.Pawn,s)
a2:a (Verse.Pawn,s,Verse.IntVec3)
a2:a (Verse.Pawn,Verse.IntVec3)
CharacterEditor.RaceTool:ChangeRace (Verse.Pawn,Verse.PawnKindDef,bool)
i:b ()
a9:b (UnityEngine.Rect,string,System.Action,string)
ah:b (Verse.Window,System.Action)
i:DoWindowContents (UnityEngine.Rect)
Verse.Window:InnerWindowOnGUI (int)
UnityEngine.GUI:CallWindowDelegate (UnityEngine.GUI/WindowFunction,int,int,UnityEngine.GUISkin,int,single,single,UnityEngine.GUIStyle)

@Hex: Marcus Huh. Looks like the issue is the Batarian's head textures, which shouldn't be happening. Not something that happens on my end, what's the rest of your modlist look like?

In that case, its probably conflicting with my Adeptus Mechanicus mods - beyond the Vanilla Expanded race mods, those are the only other race mods I have installed. Its not a huge issue, it was just really confusing to see a bunch of pink squares charging at my pawns.

If you figure out which mod specifically is causing it, let me know and I'll take a look at patching it