Okay, maybe I do..... just a little? XDDDDD
I was just thinking about what sign Undertaker could possibly be. So I listed all the traits he has in common with different signs.
Cancer:
1. You may first come across him when he's laughing the "crazy lunar laugh." It's inescapably contagious. It runs up and down the scales with a deep, throaty undertone. It giggles and gurgles, then finally erupts in a loud cackle that sounds exactly like two hundred hens laying two hundred perfect eggs. In his life-of-the-party mood, youll have no trouble finding the Cancerian. Hell be the funniest one in the room, a laugh a minute. If he's not performing himself, then he'll be grinning at someone else's antics. No one likes a joke better than Cancer, and his funny side is all the more startling when it pops up so incongruously from his normally quiet, gentle personality. Lunar humor runs deep. It's never shallow or superficial, because it stems from the sensitive observation of human behavior. Cancer may not wear his lunar laugh every day, but he can always dig it out of his old trunk in the basement at a moment's notice.
Reaper's note: I think this one speaks for itself. XD
2. These people don't pant after the spotlight like the extro-verted Leos or-clownish Sagittarians, but Cancerians have an uncanny sense of publicity, when it pleases them to be noticed. Don't let that unassuming manner fool you. They secretly enjoy attention, and they'll soak up any headlines they get. You won't find Cancer pursuing fame with passion (he pursues nothing with true passion), but he certainly won't shrink from it. He's far more likely to bask in the reflected glow of applause than to run away. Cancer may hide from things, but you can be sure that appreciation is not one of them.
RNe: He doesn't exactly seem bothered by Grell's appreciation after seeing his eyes.
3. Some of them are indisputably plump, but the great majority have a strikingly bony structure.
RN: This speaks for itself too~
4. A taciturn expert at circumlocution he is. A scatterbrain and a chatterbox he is not. Don't expect this man to bare his soul when he first meets you. Cancerians never confide in strangers, and there are certain things even their best friends don't know. It will take a long time and a fair amount of patience to really know him. If you catch him in one of his cantankerous moods, you may not be very anxious to really know him, but try again. Don't give up so easily.
RN: Nobody knows ANYTHING about him! DX!!!!
Libra:
1. Notice the entire effect of the face. It will always wear a markedly pleasant expression. Even when the Libran is angry, somehow he or she will manage to look mild, or at the very least, neutral. Venus voices are typically sweet and clear as a bell, and these people seldom raise them to a shrill or bellowing pitch. A Libran is the only person on earth who can say, "I hate you and I'm going to punch you in the nose," and sound as if he's reciting Browning's "How Do I Love Thee?"
RN: He never actually sounds or looks angry, even when he is. Like when he strangled Ciel in episode 6.
2. When the Libra scales are balanced, ifs utterly delightful, like meeting an angel from paradise. The problem is that fairy godmother. She keeps rapping one side of the scales with her wand and then the other, making Libra dip back and forth. She can't seem to make up her fickle mind whether she made a mistake or not, and she passed her indecision on to Librans.
RN: Dunno, this just seems to fit.
Scorpio:
1. Look at the eyes. They can be green, blue, brown or black, but they'll be piercing with hypnotic intensity. Most people feel nervous and ill at ease under Scorpio's steady gaze. You'll have to break the spell and look away first. He'll outstare you every time. It's a foolproof identification of the Pluto personality. Scorpio eyes bore deeply into you, mercilessly, as if they're penetrating your very soul. They are.
RN: This just seems to fit too XD
2. Next, listen to him speak. The tone can be velvety soft, husky or sharply cutting, the speech slow and measured or clipped and staccato, but what he says will never be self-effacing.
RN: He has never actually said anything about himself.
3. It's important to remember that there is a particular type of Scorpio who moves and speaks rather quickly, and appears to have an open, friendly manner. Look deeply into his eyes and really think about some of his past actions, his true behavior. He's really just playing a game with all his happy talk. Inside, he's as tough and determined as the more typical, poised Pluto people. Perhaps he's even a shade more dangerous because his disguise is better, and he fools you more easily. Start treating him as Chariie-nice-guy, who's completely harmless, and you may be courting some trouble. Be on guard with all Scorpios. I don't mean they're wicked. They're just not soft or naive. Some Scorpios, realizing that their eyes expose their inner intensity, wear sunglasses frequently, even at night.
RN: Unny isn't normally poised. He seems pretty happy.
Pisces:
1. You'll be impressed with the Piscean charm of manner and lazy good nature. He's indifferent to most limiting restrictions, if they don't rob him of his freedom to dream and feel his way through life. He's even more indifferent to insults, recriminations and other people's bristling opinions. Tell a Piscean that society is decadent, the government is cracking, air pollution will put us all in our graves and the world is coming to a dead stop, and he'll yawn, or smile enchantingly, or look vaguely sympathetic. Very little will excite him to violent action or reaction. Of course, the fish is not completely bland. He does have a temper. When he's finally aroused, he can be bitingly sarcastic, with a clever, caustic tongue. Neptunians can lash their tails angrily and spill forth a torrent of nervous irritability, but the typical Pisces will normally take the path of least resistance, and the cool waters of Neptune continually wash away his anger.
RN: He's only gotten angry once since the start of the manga.
2. There's little worldly ambition in Neptune people. Most of them wouldn't give a minnow for rank, power or leadership, and wealth holds little attraction. Few Pisces people accumulate money by the bushel, unless they marry it or inherit it.
RN: self-explanatory
3. To every Pisces, from the fisherman on the wharf to the nurse in the children's hospital, life itself is a huge stage. In the reflective eye of the fish, the entire scene is elusive and fleeting. Knowing this, Neptunians accept most storms with tranquil equilibrium.
4. Pisces represents death and eternity. The fish is the twelfth sign, a composite of all that's gone before, and his nature is a blend of all the other signs, which is quite a lot to cope with. His surprising ability to organize and concentrate on detail which pops up now and then, as well as his gentleness, reflects his inner knowledge of the lessons of Virgo. His judgment is as fair and detached as that of Libra, and his love of pleasure is also purely Libran. Pisces people have the crazy sense of fun of Cancer, as well as both the Cancerian sympathy and crabbiness. They're sometimes full of the Sagittarian outspoken frankness and generosity, as fun-loving and outgoing as Leo, yet as devoted to duty as Capricorn, and often just as envious of social distinction. There may also be a smattering of the Saturnine melancholy. Perhaps more than just a smattering. The fish can be as moody as a Moon child and as happy as a lion. He likes to tease and analyze in Aquarian fashion. He's often overflowing with Aries idealism and enthusiasm, but usually without the Mars drive. A Pisces person can zip around with Gemini quickness, talk just as fast and think just as cleverly. He can also be as lazy and peaceful as Taurus. He has the clever wit of Mercury and the soft grace of Venus, and he combines it with the mystic penetration of Scorpio, without the Scorpio's ruthlessness.
RN: Because he's this confusing XD
5. Humor is one of their secret weapons. Pisceans grin to cover unshed tears. They're masters of satire, and you may cringe from a bright remark thrown at you so casually that you're unable to pin down the exact meaning or the intent.
RN: He does stuff like this to Ciel a lot.
6. He sometimes feigns indifference. The impositions of those who would trample him force the fish to hide his true spirit.
RN: He often feigns indifference when it comes to Ciel.
Judging by all this I think he's a Cancer ascendant and sun. With some strong Pisces influences somewhere in his chart (Pisces moon maybe?). Damn... I wish Yana would tell us more! She just seems so unwilling to use him in her manga. What is she up to?