So it's easy: You can build a character with standart rules: 400 BP, normal availability. But here is the catch: You have a braindamaged GM who will allow everything (Every optional rule, as long as its in a book, and any composition of traits, races, SURGE, anything) Also you of course don't plan on playing that character really. Its just for the laughs. So. What have you build? (Don't have to break combat. Build a "Pornomancer" (god i hate that word) A guy who can drive a bicicle through the air at 150 MPH, or a man who can count microbes with closed eyes. And then add a small desciption on how "it" would work, what he COULD do.
My first entry would be this Monster:
Vampire : -100 BP
Str: 1 Cha: 3+5
Bod: 1+2 Int: 2
Agi: 3 Log: 1
Rea: 3 Will: 2+5
Edge: 2+4 Magic: 1+5
Ini: 8/2IP
150+105 BP
=255 BP Rest: 45 BP
Qualities:
Magician -15BP Cha-based possession tradition of choice
Free Spirit Pact (Drain +4) -20 BP
Aspected magician (Conjuror) optional Rule: Expert aspected magician (+2 dice) +5 BP
Gremlins (4) +20 BP
Spirit Bane (Plant) +10 BP
+/- 0 BP
Skills:
Summoning (Guardian): 6 (

-26 BP
Equipment (15BP=75.000)
Summoning Focus (4) 60.000
Heavy Leadpipe 0 Str/2+1 damage, Reach: 1
Foam Explosives (R15) 10 kg 15.000
Bound: Summoning Focus (4): 4BP
Modus Operandi:
Summons a rating 12 Guardian Spirit for possession of himself, DP: 6 (magic)+6 (skill)+2 (spec)+2 (expert summoner)+6 (Edge) =22 Dice against 12 of the Spirit.
Expected: ~8 successes, and ~4 for the spirit.
Drain: 8DV, DP: 7 (Will)+7 (Cha) +4 (Spirit Pact) +6 (Edge)=24 Dice
Which should be about 8 successes. Even in the „worst case scenario” of the spirit having ~10 hits
it is very possible he would be still standing (If he rolls above average too... and has a good medical team for the overflow *g*)
Ok, so we got a dude; Str 13, Bod:15, Agi:15, Rea 15 Ini: 33 / 3IP, steered by a mage who has enough services owed to describe in gruesome detail what the spirit should do... Also he has got a hardened armor of 24... and it would be discussable that he might still be able to regenerate damage. (Ok that's pushing it. Magicical abilities should fall off an possessed character *g*)
The Spirit uses its natural Weapon: DV 12, 27 Dice to attack. Oh, you want to stunbolt him? Well tough luck, he has magical Guard: Will+Magical guard =24 dice against that. Hm...
God, this man needs only to train his attributes a bit and he will be a complete monster. (Also learning channeling and invokation may be funny too) Maybe one could even try to raise magic and try a Force 14 Spirit, also getting buffed on his drain attributes by a friend or learning to do it himself would be nice too.
Ok, let's see what you've got.