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This is the most broken, most ungodly powerful PC I can conceive of while sticking to the rules of the game. That's right, this character is, according to the letter of the rules for the numerous settings that have spawned this unholy abomination, perfectly legal. Samuel Haight ain't got nothin' on the god of all.

Twinky McTwinkburger

To begin this exercise in madness, I create a Sorceror with 5s in Intelligence and Law and Specialties in Demons and Demon Pacts, giving him extra dice when he rolls 10s. Not only that, but he possess a magic suppository (Wonder 5) allowing him to lower the difficulty of any roll with a Demon by 3. Twinky also buys the Merit Unbondable. He calls up a Demon for some Infernal Investments and after some serious wheeling and dealing, Twinky gets Attributes, Abilities at 10, every Background available to him 5 and all Spheres maxed to 5, plus some other stuff at a discount for pieces of his soul.
Twinky moves on using his megastats to trick a Shih into teaching him Chi Abilities, giving him access to Yin and Yang Chi (Demon Hunter X). Not yet the ultimate power in the universe, Twinky promptly butchers five Garou and uses their pelts to perform the Rite of Sacred Rebirth, transforming himself into a Skindancer, complete with Gnosis and Rage. Once Twinky has mastered his Garou powers, he tracks down a sleeping 4th Generation Vampire, gives him a psychic lobotomy using Mind 5. Twinky now has a supply of Vitae to make himself an Independent Ghoul (Ghoul: Fatal Addiction). Because he’s Unbondable, he can drink as much Vitae as he wants and max all Disciplines he learns to 5.
After so much evilness, Twinky attracts a particularly nasty Bane that wants Twinky’s awesome powers in service to the Wyrm. Too bad Twinky is so awesome that slaps the Bane down will nothing but Spirit and Willpower. Twinky jumps to Malfeas, backhands the Wyrm, and tells it not to try anything like that again, otherwise, Twinky will be back and next time, he will super-power his backhand with The Pimp’s Prayer.
On a pleasure trip to the British Isles, Twinky discovers that he is a Kinain, allowing him to learn Arts and Realms. He also gets a Glamour score. Immunity to the Mists and Banality. Holly Strike FTW! No problem getting Glamour, Prime works on that front.
Now, Twinky is sick to death of Paradox, so he turns himself into 5-dot Prime/Spirit Wonder, shunting any Paradox he gains into the Umbra. After this, he heads off into the Shadowlands, turns himself into the living Fetter of a few Wraiths. While he can’t personally use Arcanoi, he’s placed plenty of it at his disposal. Since he’s tripping around the Spirit Realms, he tracks down some powerful spirits and binds them to his will using his Spheres and threatening to HULK SMASH! (go Crinos) and chop them up. Now he has high-level Spirit Charms at his disposal.
Twinky now does what all godly supercreatures in the world of darkness do. $100,000 buy-in Texas Hold’em in Atlantic City.

May I raise a couple hands here?

Sorcerers don't have spheres, they have Numina paths, which don't give much power, even at the highest ends. (See WOD:Sorcerer). Unless you're meaning just a sorcerer as a Mage, in that case, carry on.

Most books suggest that STs not allow characters to start with 5s in abilities unless the player has a very very good reason behind it. Many Core books suggest not being able to put 4 or 5 into an ability without freebies in the first place, granted starting from a "normal" human mold you have 21 of those to burn, but...(Not getting in to the back story that would allow for your specialities.)

Other issues are, well, for one, You owe favors to how many powerful and evil entities? Two, until you became a Garou via the rebirth ritual (and also extremely tainted and bane-ridden via same ritual), anything with magic resistance/immunity and a shotgun could have stopped your crazy backside...after that? Well, congratulations you're a threat to the entire world, not to mention the 12 Tribes, you've made yourself a Caern-raper, siphoned powers from spirits, became a Skindancer, stole Kuei-jin powers, etc. Your Taint would be so great that any werewolf would just have to look at you to know you're a threat. Sure you're big and bad now, but after..say...the silver pack? Or just any pack of Rank 5 Silver Fangs got through with you? (Paws of the Newborn Cub would make you just another sad mortal.)
Of course, you leeched a leech, and not just any leech, but an ancient one..you would have just made yourself something so big that the Garou and the Vampires would end up tag-teaming to take you out, not to mention the mages of the Traditions, wraiths, Kuei-Jin, demons....you've made yourself enemies with practically every supernatural entity in the world

So why stop there? You've grabbed powers from most of the races, why not continue? Find out the secrets the Bastet keep hidden (Yava) and force them to be your shock troops, or threaten to destroy their entire race. Wake up a few Gurahl to figure out how to cheat death, convince the Ratkin you're the Rat God personified, learn Thaumaturgical paths, heck, you're brilliant enough, with enough resources, find out how to become an old-school Mummy and be unkillable save by a nuclear explosion (and then fight the Death Bear to come back from even that.).

Personally? I think you're trying too hard, you're missing the easy ways to be bug-crazy.

Fomori out of Freak Legion (Take the Supernatural kinfolk merit, use the power of your pathetic aura to convince some hapless Children of Gaia to teach you Kin-gifts.). Could even go so far as to be Embraced, although I'm not sure the exact rules on Embracing Fomori.

For one quick note...Oh and you're missing something that makes Haight still bigger then you.

The Staff of the World Tree gives him over 200 points of Quintessence and adds 4 dice of power to every Countermagick roll he makes (he has a total of 9 dice to such before that.) Not to mention, Thieving Talons of the Magpie will let him steal your abilities and turn them on you...
Or the fact he has the entire Outcast tribe of Skindancers behind him...
Or the Puppeteer banes he picked up in Valkenburg...


In short, I must applaud you for the idea, it is indeed a wonderful bit of Twinkery, however in the end it's just too far gone not to be completely annihilated by a coalition the likes of which have never been seen before (And doubtfully ever will again.)