NGUI 解析用メモ　たぶん意味不明です。
UIFont

0x0: (0: 同じファイル)
0x4: (GameObject AgencyB_32)
0xC: 不明
0x10: (1: globalgamemanagers.assets)
0x14: (138: UIFont)
0x1C: 不明

public class UIFont : MonoBehaviour
{
    [HideInInspector][SerializeField] Material mMat;
    [HideInInspector][SerializeField] Rect mUVRect;
    [HideInInspector][SerializeField] BMFont mFont;
    [HideInInspector][SerializeField] UIAtlas mAtlas;
    [HideInInspector][SerializeField] UIFont mReplacement;
    [HideInInspector][SerializeField] List<BMSymbol> mSymbols;
    [HideInInspector][SerializeField] Font mDynamicFont;
    [HideInInspector][SerializeField] int mDynamicFontSize;
    [HideInInspector][SerializeField] FontStyle mDynamicFontStyle;
}

mMat = 0x20: (0: 同じファイル) 0x24: (7: Font Atlas.mat)
mUVRect = 0x2C-0x38: 0f, 0f, 0.5f, 1.0f

public class BMFont
{
    [HideInInspector][SerializeField] int mSize;
    [HideInInspector][SerializeField] int mBase;
    [HideInInspector][SerializeField] int mWidth;
    [HideInInspector][SerializeField] int mHeight
    [HideInInspector][SerializeField] string mSpriteName;
    [HideInInspector][SerializeField] List<BMGlyph> mSaved;
}

mSize = 0x27 (39)
mBase = 0x20 (32)
mWidth = 0x100 (256)
mHeight = 0x100 (256)
mSpriteName = "AgencyB_32p"

mSaved.count = 0xBF (191)

public class BMGlyph
{
    public int index;
    public int x;
    public int y;
    public int width;
    public int height;
    public int offsetX;
    public int offsetY;
    public int advance;
    public int channel;
    public List<int> kerning;
}
index = 0x20 ' '
x = 9
y = 32
width = 3
height = 1
offsetX = -1
offsetY = 38
advance = 7
channel = 15 (RGBA 1+2+4+8)
kerning = null

0x1E38～
mAtlas = resources_00002.-16
mReplacement = null
mSymbols = null
mDynamicFont = null
mDynamicFontSize = 16
mDynamicFontStyle = FontStyle.Normal

UIAtlas

0x0: (0: 同じファイル)
0x4: (GameObject.Font Atlas)
0xC: 不明
0x10: (1: globalgamemanagers.assets)
0x14: (646: UIAtlas)
0x1C: 不明

public class UIAtlas : MonoBehaviour
{
    [HideInInspector][SerializeField] Material material;
    [HideInInspector][SerializeField] List<UISpriteData> mSprites;
    [HideInInspector][SerializeField] float mPixelSize;
    [HideInInspector][SerializeField] UIAtlas mReplacement;
    [HideInInspector][SerializeField] Coordinates mCoordinates;
    [HideInInspector][SerializeField] List<Sprite> sprites;
}

material = Font Atlas.mat

mSprites.count = 2

public class UISpriteData
{
    public string name;
    public int x;
    public int y;
    public int width;
    public int height;
    public int borderLeft;
    public int borderRight;
    public int borderTop;
    public int borderBottom;
    public int paddingLeft;
    public int paddingRight;
    public int paddingTop;
    public int paddingBottom;
}

name = 'Agency_32p'
x = 256
y = 0
width = 256
height = 256
borderLeft = 0
borderRight = 0
borderTop = 0
borderBottom = 0
paddingLeft = 0
paddingRight = 0
paddingTop = 0
paddingBottom = 0

0xB0～
mPixelSize = 1.0f
mReplacement = null
mCoordinates = null
sprites = null



level1_00504.-15

良さそう
最後の部分は styles.xml の修正だけでは pick up item はフォント変更が出来ないのですが level1_00504.-15 をいじれば変更できますという話です。
他にフォント変更できない致命的な部分があれば教えてください。

下のスキルアップ等が表示される部分
lblTooltipLine
00167.-15