I actually looked up his chart just now. His time of birth is unknown, but his Mercury (planet governing the third house) is, in fact, in Scorpio (ruled by Pluto). No wonder he has such a sharp tongue and knack for winning verbal arguments (and perhaps being creative with his harsh insults). Try not to be too domineering for your own good. Find a way to make that aspect work in your favor rather than letting it get the best of you, because that’ll only create unwanted drama for you and those around you. Maybe since you have Pluto in the third you can use it creatively? Start writing or painting when you feel like you’re getting too steamed? It’s all about channeling that energy into something more positive!
Eminem has Pluto in 10th (Sag AS), the birth time posted in Astro is correct.
I've made a deep study of his house placements and rulers in L-G forum and it's accurate.
I don't know if I can put link here or if I must copy-paste what I've written about his chart.
He has Chiron in Aries in 4th opp Mars in 10th. Mars has a wide conj. with Pluto. His ruler of 10th and also the natural ruler of 3rd house, Mercury, in his 11th house (groups, masses). His ruler of 3rd (aquarius-uranus) in 10th.
He needed to discharge his anger and sadness (chiron opp mars) publicly (10th) to masses (11th) through harsh writting (Mercury in Scorpio, quincunx Chiron. Venus quincunx Chiron, too). Writings he had the need to make public due to his 3rd ruler in 10th.
His Sag AS and its classical darts (I live with someone who has Sag AS as well and I know how is it) + Scorpio wrath did the rest.
Here is a small fragment of what I wrote about this placement:
"In addition, Chiron is opposite to his natal Mars in 10th, which implies that all those problems have been made public (songs attacking his ex-wife and mother, for example, or the legal issues that happened later, if even the guy who left him in a coma when he was a child sued him, and that came out in all the media). It could also reflect the bullying received, the verbal violence from his mother, the vindictive aggressiveness he showed towards his ex-wife through his songs (regent of house 3 [Aquarius-Uranus] in 10. Could it be related that he has the natural ruler of 3rd house, Mercury, in Scorpio? That would explain, also, the diss he has done to other people throughout his career, almost always responding to attacks that people made to him. All we know that revenges of Scorpio are relentless... Well, for something some people classify him as a "career destroyer". If we add to that the verbal darts of a Sagittarius AS...)".
And a fragment of what I've found in campus-astrología:
"- 3rd in 10th: "As usually happens with those who have the ruler of the third in the first, here there's a clear need for everyone to listen to their personal ideas and thoughts. But in this case it's possible that the person feels more comfortable becoming hearing from the stage. This need to express oneself becomes a projection of the ego and usually ends up projecting the person in some way by the light of the footlights. The attention of the public is usually attracted through what is written or said, rather than by the acts that are carried out.
If the ruling planet has aspects of tension, they're looking for notoriety or they can have a lot to say, but it freezes when they have to say it in public (note: Uranus has a good relationship to his personal and transpersonal planets, but who knows if a heavy transit could trigger this)."