Bism Allah Alrahman Alrahem
If there is only one single word describing Prophet Mohammad (peace be up on him) is what Allah Almighty said about him in the Holly Quran (21:107):
We sent thee not, but as a Mercy for all creatures
Prophet Mohammad (PBUH) is a mercy not for the Muslims only and not for mankind only but for all the creatures. He represents Islam as a mercy not as a killing or wars or bloodshed or similar issues. Mercy is against all the mischief and it represent the kindest way of care for the entire creatures one for each other. It is therefore reflect itself on the environment and on everything.
Allah created the people free and they should be free with no obligation whatsoever as far as they will not harm each other. It means they should respect the choices of each other. This is what it should be in Islam. The judgment about their deeds left for Allah.
Throughout the history too many Muslims and non-Muslims distort and misrepresent the true and right image and principles of Islam.
God chose prophets right from the beginning of the mankind on the earth to guide the people via Him (Allah). The last prophet is Prophet Mohammad (PBUH) following him Prophet Mohammad (PBUH) advised that the Earth will never be vacant from a guide and that there will be twelve Imams after him. God never and will never leave the mankind without existed guide authority (Imam or prophet) and the Imam of this era is Imam Al-Mahdi (PBUH) and may Allah Almighty fasten his appearance soon. Prophet Mohammad (PBUH) said that Al-Mahdi is from my sons and when he comes he will fill the Earth with equality and justice after it is filled with inequality and corruption.