Obito and Rin are two side characters from Naruto Shippuden.  
Naruto is part of the Big Three Anime of all time along with One Piece and Bleach. 

Obito Uchiha is one of the most popular hero turned villain from Naruto Shippuden. 

Obito has shown all the shades there are of an anime character. 

Obito shows his innocent dream of becoming the Hokage of the hidden leaf village as a kid. 

He shows his cold and cruel side when he kills Minato and Konan. 

He shows his funny side when he desiges himself as Tobi. 

He shows his villainous side in the Fourth Great Ninja War. 

He even shows his sharp intellect to everyone when he turns out to be the mastermind behind the Fourth Great Ninja War, Minato’s death and even assisting Itachi in the Uchiha Masssacre. 

Rin’s death plays a crucial role in deciding the path Obito chooses to move forward with. 

So I wonder how things might have turned out if he did manage to save Rin.

1.

Obito Could Have Succeeded Minato As The Fifth Hokage

2.

Kakashi Will Not Be Able To Awaken His Mangekyou Sharingan

Related :

What Do The Deaths In Naruto Signify? 

3.

Minato Will Not Sacrifice Himself To Protect The Village From The Nine Tails Attack 
4.

Naruto Will Not Have Kurama 
5.

Naruto Wouldn’t Be Raised As An Orphan
6.

Minato Would Save The Third Hokage During Orichimaru’s Assault On The Leaf
7.

Yahiko Will Be Saved As The Other Akatsuki Members Will Show Up In Time To Back Them Up
8.

Minato Will Not Let The Uchiha Massacre Take Place
9.
The Akatsuki Of The Motive Of Capturing Tailed Beasts Will Not Be Formed
10.

Obito Will Not Kill Konan
11.

Pain Will Not Kill Jiraiya
12.

The Fourth Great Ninja War Will Never Take Place
13.

Neji Hyuga Will Not Be Killed By Ten Tails 
14.

Madara Uchiha Will Never Be Revived By Obito By Using The Renne Rebirth