Seeing how Antrakha did some theories, I wanted to go deeper into them, to see if we can discover more about them.
Firstly lets talk about Ruby and the song "Red Like Roses Part II". Like the theory is Ruby will have to mature and grow up, and it seems like she will face something tragic in either two ways. One, if Crimson is her mother, this would be the fact she realizes her only blood related kin is on the bad side, causing her to go through some trauma and not wanting to fight her mother, and possibly kill her, IF, only if the tombstone was dedicated to her father and only if Crimson is her mother. The problem is that could make this not her father is the fact that the cloak is white and that the face looks more feminine, which brings me to another theory about her growing up.
Either Yang or Weiss will die.
I'm assuming its either Weiss and Yang for the following reasons. Firstly, the cloak is white and the inside is red, much like some of Weiss's natural attire. The time Ruby is fighting the beowolves in the first trailer is obviously winter, but its still snowing. The thing that proves this wrong is that the symbol on the grave is not belonging to Weiss, looking more similar to Ruby's.
Yang is the more plausible vitcim if this part of the theory is true. Lets look into the lyrics shall we?
"I wasn't dreaming when they told me you were goneI was wide awake and feeling that they had to be wrongHow could you leave me when you swore that you would stayNow I'm trapped inside a nightmare every single f'ing day,"
"I know you didn't plan thisYou tried to do what's rightBut in the middle of this madnessI'm the one you left to win this fight,"
This seems like she is talking about one specific person, which in this case, is Yang since she is the most attached to, but then again, she will get attached to the gang more and more as time progresses, but I think Yang may be more plausible. Plus, it is shown that Yang cares deeply for her sister, so she may sacrifice herself later on. But then again, there are lyrics suggesting it is talking about Ruby's "mom", Crimson,
"To have you in my life was all I ever wanted
But now without you I'm a soul forever haunted
Can't help but feel that I had taken you for granted
No way in Hell that I can ever comprehend this"
It sounds like this is talking about either Crimson or Yang, but it is hard to tell.
But. There is another theory I found out about Summer Rose. Summer Rose is mentioned on the tombstone, which is a reference to the poem, but what if Ruby was perhaps an incarnation of Summer Rose? Here let me explain by using this theory from wikia contributors, ImposterParrotGrass and OrangeMoonGoddess, and an anonymous Wika Contributor
IPG- "Maybe it means that Summer lost everyone she knew in the war or something. And if Ruby is a kinda sorta reincarnation of her, maybe it's fated that this will happen to her, but she fights agents her fate to save her friends."
OMG-"It's possible that Ruby could go through the same thing as well, but I don't think it would be because Summer Rose (possibly) did back in the war (with the whole fate thing. That would be a terrible family trait/coincidence). Maybe if they were/are in similar situations, that could happen. With the looming threat of Grimm, and whatever it is Roman + crew have planned, I can see that things are going to get ugly one way or another. It's possible that Ruby could lose and or save her friends in the process and have either a tragic or happy ending depending on how things go (going back to a possible tragedy which hopefully can be averted). I for one think Ruby will actually succeed in resolving the problem, unlike Summer Rose (err, if that's what happened at all, that is... Speculating off of speculations based on sketchy/vague facts is hard!) "
Anonymous- "There's some speculation that Summer Rose is an ancestor - possibly mother or grandmother - of Ruby. Also, if you look at the lyrics in "Red Like Roses: Part II", it seems like Ruby lost someone very close to her and has been somewhat affected by it ever since. You'll notice that Ruby wants to make friends but finds it difficult; and although she and Yang refer to each other as sisters, they have different last names and may be adoptive sisters.
Also, since that song played while Ruby was taking out the Nevermore, it might be a reflection of her thoughts/emotions at that moment. If that's the case, it's not unfeasible that Ruby's loss in her past is what really drives her to hunt Grimm.
Obviously the poem has to have some meaning, but the question is whether it's applying to Summer Rose or Ruby. If it's Summer, it might give us an idea of how she died; perhaps she and her team were fighting a very strong monster, and her teammates were either killed or abandoned her, and she was unable to defeat the monster on her own. That's why her grave states "Thus kindly I scatter" (directly taken from the poem); the poem itself is saying that the rose is beautiful, but lonely, and is better off with its petals scattered where its "friends" lay.
If we're relating it to Ruby, it does seem to foreshadow some very dark future events. It's also worth pointing out that when she kills a monster, it turns into petals which scatter everywhere. That doesn't happen with anyone else, though, and we saw Weiss bleed in her trailer. I tend to think the poem is supposed to be relevant more to Summer Rose than to Ruby."
Now, I think that the idea of Summer Rose is more ideal, but in terms of offing a character, its too damn early in the show for us to know so I doubt a death will happen in Season 1. We will just have to wait and see.
I wanted to more analyzing of theories but as of now, I think this is enough. Hope you enjoyed it.