QUOTE (Twizzler @ May 30 2014, 07:29 PM)

What build do you have in mind that can succeed in starting by himself/herself in the middle of an Ares facility after being made, with no guns, and HTR teams approaching? [Shadowrun fourth edition, all sourcebooks]
My GM joked about giving me this punishment and thinks I won't be able to accomplish it, seeing as how I am completely new to Shadowrun, and relatively new to tabletops in general (but having so much fun). So when I found this awesome forum, which has already been able to explain so much already with a quick search here and there, I thought "What a great place to ask!"
In all, I would really like to take my GM up on his offer, I think it would be funny if I were able to outsmart him (by letting you guys outsmart him, admittedly).
Thanks in advance!
P.S Oh and I asked him if I can have magic and drones, he said yes. So that's a start!
QUOTE (Twizzler @ May 30 2014, 07:50 PM)

TIL you can use Divination in Shadowrun. Huh.
That'll throw my GM for a loop.
QUOTE (Twizzler @ May 30 2014, 08:14 PM)

Sorry, forgot to say that we start with 500 BP for characters. As for background count, I'm gonna go ahead and say no. As in magic will work as normal (which is a background count of what? One?).
Edge? I don't think so, its supposed to be my punishment, so max edge for your character, and no "Hand of God" unfortunately.
I'm curious to know why you are being 'punished'. Aside from what this might tell me, in the following I assume the GM is fair and plays his NPCs intelligently. I also assume that he knows the rule books well enough to be confident in his ability to counter anything you throw at him.
I strongly agree with the general tendency in the answers above to avoid combat. A well played team of NPCs will always win a protracted firefight, whether magic is involved or not. You can't win that way.
Talking your way out is a better option, but I suspect this situation precludes success that way, too. A combat team won't negotiate with you, they will capture you and hold you till
their pornomancer comes to pick your mind clean.
I believe evading contact is your best way to go. An AI sounds interesting, but the Matrix is my weakest sphere of SR knowledge. So I vote for the Free Spirit as well. Materialization, rather than Possession, though that could be fun, too. There are specifics, though.
The two complex action escape back to the home plane is so obvious, the GM must have a dodge around that. Now, I can't think of a guaranteed way to prevent this action, as others have said, but there could be something the GM has thought up. For example, this being Ares, they have experience in metaplanar actions. So, maybe they have your metaplane known and covered and are waiting there for you to return. Maybe there is shit going down there and you have come here to the facility that is the source of the trouble to nip things in the bud. Whatever PC you might choose to build, the GM is going to have to have a story as to why you are in this fix in the first place. That story could/should be able to deal with the easiest ways to evade the problem the GM has set for you.
So, let's assume the Free Spirit PC can't just run home. Which means he/she/it (let's go with it) needs to sneak out. So I would give it the following traits. I won't flesh the PC out completely, but just pick out the things I can think of that it needs. I also assume that though you get 500 BP, you are subject to the limits of chargen, and since you have no karma to begin, you cannot do things like Initiate.
Give it t least Force 5. Make it 6, so that potential background count of 1 is accounted for. This guarantees you 5 points of spirit powers for your PC and at least 10 points of Immunity to Normal Weapons, so the guys with the guns will have trouble hitting it, should they find it. Its Magic will equal its Force. Take Aura Masking for 3 points, Realistic Form for 0.5 points, and Mutable Form for 1 point. These are essential. The other half point could be Guard, to keep you from glitching on any rolls. If you can use the 6th point, go for something cool. Divining is 1 point, and allows the cheesiness of the Divination metamagic. It's unfortunate that you can't afford Concealment, which is 2 points.
Make sure it's Intuition is as high as possible, too. With Force 6, it is limited to 6. All this is already very expensive. 250 BP to start, with all attributes at 2. Raising Force, Edge and Intuition to 6 each costs an additional 55 BP, so you have already spent 250 + 165 = 415 BP. Add Spellcasting and Counterspelling at rating 5 which cost 40 more BP. Add four spells, Stunbolt, Stunball (if you absolutely must fight), Shattershield and Pulse. These add another 12 BP. So far you have spent 467 BP, but this is the minimum you need to evade with this PC. Go wild with the other 33 BP!
Almost certainly you are being watched by some camera somewhere in the room. Given the wording of the situation, there is no spirit present, otherwise the HTR team would not be coming, it would already be there. Use Pulse to shut off the camera(s) momentarily. This will allow you to dematerialize and rematerialize with Mutable Form as something small and mobile without high level software detecting the difference in the room as you rematerialize. I like spiders.
This is where its spirit powers really come in. With Realistic Form you look to all normal senses like a spider. With Aura Masking, Assensing has to beat Intuition + Magic + Edge = 18 dice. This is reduced to 15 dice in BGC of 1, but the Assensing entity is also hampered. A fair GM is not going to throw unlimited Assensing on everything in the building and then say, "Eventually, something sees you for what you are."
So, as you crawl through the ductwork, sooner or later a spirit or astrally projecting magician will come through and check you out, once. Then you use Edge to add dice and explode the 6s, so you are likely to get around 10 or 11 hits, or save the Edge to reroll misses and get around 13 hits. Highly unlikely the Assensor will detect you. If you absolutely must, blast anything that sees you with Stunbolt/ball and transform again if necessary.
At the perimeter, there will likely be some kind of astral barrier, likely a Ward. That's what Shattershield is for. Use edge here, too, as the Ward can actually be covered by Counterspelling. Once free of the facility, run like hell for cover, changing and morphing as often as necessary to throw the posse off your trail.
Nothing is guaranteed, but this will give your GM a run for his money.
EDIT:
Alternatively, you could materialize as a ream of photocopier paper, and wait a few weeks till the heat is off, screw with a few minds, and then get out.