自己尝试找了一会儿终于找到Window_Message了，
然后试着在Window_Message.prototype.startMessage里面强行插入了上面那段代码……改了改大概是这样的。

JAVASCRIPT 代码复制

Window_Message.prototype.startMessage = function() {
    this._textState = {};
    this._textState.index = 0;
 
var textcopy = this.convertEscapeCharacters($gameMessage.allText());
var sizeoftextcopy = textcopy.indexOf('\n');
var resulttext = textcopy.substring(0,sizeoftextcopy);
var resulttext2 = textcopy.substring(0,sizeoftextcopy+1);
if (resulttext == "哈罗德"){
resulttext = "\\c[2]【哈罗德】\\c[0]";
textcopy = textcopy.replace(resulttext2,resulttext+"\n");
}
    this._textState.text = textcopy;
    this.newPage(this._textState);
    this.updatePlacement();
    this.updateBackground();
    this.open();
};

Window_Message.prototype.startMessage = function() {


    this._textState = {};


    this._textState.index = 0;


 


var textcopy = this.convertEscapeCharacters($gameMessage.allText());


var sizeoftextcopy = textcopy.indexOf('\n');


var resulttext = textcopy.substring(0,sizeoftextcopy);


var resulttext2 = textcopy.substring(0,sizeoftextcopy+1);


if (resulttext == "哈罗德"){


resulttext = "\\c[2]【哈罗德】\\c[0]";


textcopy = textcopy.replace(resulttext2,resulttext+"\n");


}


    this._textState.text = textcopy;


    this.newPage(this._textState);


    this.updatePlacement();


    this.updateBackground();


    this.open();


};

但是还是存在着颜色不能显示的问题，实际显示的还是\C[]而非颜色的修改。
到底是出了什么问题呢？
==============================================
自己改了一下，发现13行改成这句就可以了
this._textState.text = this.convertEscapeCharacters(textcopy);
虽然从头到尾不知道自己写的代码是什么意思，但是能用就好

试试这个？https://www.jianshu.com/p/e4fdcf3b09cf
YEP.73 – Message Macros