rin

[the last uchiha]

i cant find her last name anywhere which makes me fink shes come from
an important clan we already no she from the hidden leaf thats
lead me to fink she is a senju
thats why the mist anbu wanted her so badly
mabey they needed her to become the jinjiriki(spelling ino)
of the mist ? ever that or she is a unknown clan
of the leaf with a special blood line technique
what do you guys fink

 

[6pathSage]

I Think she might of been an uzumaki and was to be the next vessel for kuruma or she knew many sealing techniques for tailed beast. And the mist wanted her For their use

 

[badoera]

There are alot of theories going on.. one you stated already

Rin possessed a special bloodline limit or senju dna

Rin had knowledge on certain subjects

Rin was a hidden mist spy

kakashi and Rin both realized they couldn't win this fight so Kakashi killed Rin to avoid that she gets tortured ...

there are probably more crazy theories about it

 

[The Hidden Shinobi]

Well the cloud did try and capture kushina because she was special maybe rin is special somehow we will find out soon hopefully