LibreOffice - unlike Microsoft Word - does not offer to change the color of Arabic diacritical marks (tashkeel/harakat). However, there are two tricks.
Arabic keyboards lack many important special characters. Here is a list of the most important characters and signs which you can copy and paste.
Hayya حَيَّ is used in the call of the Muezzin: Come to prayer! حَيَّ عَلَى الصَّلاةِ. It is a special word type: a Ism al-Fial (اسم فعل).
A final Aleph (ألف) in Arabic to express the accusative case (منصوب) can be tricky. Where do you put it on a final Hamza (همزة)? Here are the rules.
The word "me" can be the direct object of a verb (like in: help me!) - but this is not our story here. We talk about the word إِيّايَ.
The letter Nun can be used to convey emphasis (energetic). There is a "light" and a "strong" form. Here is how it works.