This kind of goes against what a Tank is, but...
It's possible, and its what a lot of inexperienced players do. It's not as efftive post-ED of course.
Energy Melee is the most damaging tanker set, and Energy Transfer the most damaging power.
I really should do something about this signature.
You can make a tank that by lvl 50 is 3 slotted res/def in all primaries and fighting pool and 3 slotted in all secondaries for damage quite comfortably, the most offensive tanker i would "imagine" would be fire/fire(depending on how you measure damage)/ice epic. it does come down to how you measure damage though, ie single target, multi target, what damagetype villains have least resistance to overall(in which case energy and elements could be forerunners faik), dpss, dpsa. I made a fire/energy brute anyway thats heavy on the single target damage. Either way fire primary. I dont get too much into min/max figures though and i dont claim to know any, it'll just do my head in.
He will honor his words; he will definitely carry out his actions. What he promises he will fulfill. He does not care about his bodily self, putting his life and death aside to come forward for another's troubled besiegement. He does not boast about his ability, or shamelessly extol his own virtues. - Sima Qian.
I guess if you want to be a tanker that focuses on offensive you want a primary that demands a minimum number of powers. I assume that all are going for fitness pool and a travel power + prerequisite.
Must have earlyish primary powers for defensive purposes, I put more optional powers in brackets. I'm not including Auras unless they provide significant defensive bonuses.
Firey Aura 3(4): Fire Shield, Plasma Shield, Healing flames,(Acrobatics from Leaping).
Invulnerabilty 4(6): (RPD), Temp Inv, Unyielding, Dull Pain, Invincibility, (Tough Hide) .
Ice 5(6): Frozen Armour, Hoar Frost, Chilling Embrace, Wet Ice, Glacial Armour, (Energy Absorbtion)
Stone 4(6): Rock Armour, Stone Skin, Earth's Embrace, Rooted, (Brimstone Armour), (Crystal Armour)
So of the 4 I'd probably go for Firey Aura too. With 3 powers you get pretty much all of the protection from the primary, you are missing immob and knockback protection which can be obtained from Cambat Jumping and Acrobatics from the leaping pool. It is also very cheap endurance wise unless running Blazing Aura. Fire also has an endurance regaining power in consume and 2 damage dealing powers, Fiery Embrace and Burn.
The next best is probably invulnerability, however 2 of its 3 toggles are more expensive than Fire ( Temp Invulnerability and Unyielding ). Also Dull Pain is a less useful heal than Healing Flames, especially in the early levels.
Personally I don't like the offensive tanker idea, it has some flaws which are mainly to do with 2 things:-
1. Tanker damage isn't that great until the big attacks at high levels ( Knockout Blow, Cleave, Greater Fire Sword, etc ), normally 35 and 38.
2. People have the expectation that you will be keeping them safe, that's generally why they invite a tanker rather than a scrapper.
However if you take these 2 things into consideration it might be worth a try.
@Unthing ... Mostly on Union.
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You can make a tank that by lvl 50 is 3 slotted res/def in all primaries and fighting pool and 3 slotted in all secondaries for damage quite comfortably, the most offensive tanker i would "imagine" would be fire/fire(depending on how you measure damage)/ice epic. it does come down to how you measure damage though, ie single target, multi target, what damagetype villains have least resistance to overall(in which case energy and elements could be forerunners faik), dpss, dpsa. I made a fire/energy brute anyway thats heavy on the single target damage. Either way fire primary. I dont get too much into min/max figures though and i dont claim to know any, it'll just do my head in.
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You can get away with 4 dmg res in ur shields, and 4 in ur attacks, well i can (Fire/Fire)
Retired - For Now
@Infernius - 50 Fire/Fire Tanker
AeoniX - 50 MA/Regen Scrapper
Syinf - 36 Katana/SR Scrapper
Proud Member Of The FORUMITES
The 4th slot for dmg res is useless, you gain a little less than 1% from the 4th SO, hence better put those slots somewhere else, say in an attack 
The heavy attacks are absolutely worth 6 slotting(KO Blow, Footstomp, Incinerate, Fire Sword Circle, Energy Transfer, Total Focus and the like)because I would put at least an end rdx enhance in them since all of them are endurance hog and a rec rdx because they have very long recharge rate.
Then for an offensive tanker I would go for a Fire³ Tanker, so get both Build Up and Fiery Embrace then fire off Combustion, Fire Sword Circle and Fireball for amssive AoE damage, or as a second option Energy Melee(always with Fire primary and epic)to hit the bosses with the big attacks and flatten the rest of the mobs with fireball and whirling hands along with bone smasher
I have 6 slotted all of the attacks on Golden Golem apart from Scorch and Boxing.
The 6 slotted ones are Combustion, Fire Sword Circle, Incinerate and Greater Fire Sword. All are slotted 1xACC, 1xEND, 1xRCG, 3x DAM. Even with Hasten running I still have attack chain gaps depending on what I'm doing. However I found Build Up is not that great with /Fire because of the long animation times, FSC particularly has a nasty 2 seconds pause at the end of the animation which means that you can maybe manage 3 attacks max before it runs out.
I would have thought an offensively minded tnak would be one who concentrated on damage from an early point not just in the last 15 levels.
@Unthing ... Mostly on Union.
I think you can be very offensive and still resistant enough to tank, this all comes together in later levels though. Tank first - killing machine later so as maybe to have people that permanently want to team with you as opposed to "omg i am powerdebting with this tank" - quits team.
I personally find the key to keeping my tanker on her feet is keeping everyone else on theirs as no matter how far you go to make your tanker offensive the team are always going to be more offensive. The quicker everything is killed the less damage you or anyone else takes. Play smart, herd groups to a safer kill area and try to be careful you dont herd the team into an ambush. Everyone has an off moment though and people get over it, its how you do most of the time that matters.
If i wanted a toon to solo easily i'd just go make a /regen scrapper.
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Then for an offensive tanker I would go for a Fire³ Tanker
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When i said fire/fire/ice, fiery embrace completely slipped my mind so yeah i am inclined to agree before looking at things deeply as i'd need to look at attack chains. Either way squeezing powers and slots in may prove a pig.
He will honor his words; he will definitely carry out his actions. What he promises he will fulfill. He does not care about his bodily self, putting his life and death aside to come forward for another's troubled besiegement. He does not boast about his ability, or shamelessly extol his own virtues. - Sima Qian.
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I have 6 slotted all of the attacks on Golden Golem apart from Scorch and Boxing.
The 6 slotted ones are Combustion, Fire Sword Circle, Incinerate and Greater Fire Sword. All are slotted 1xACC, 1xEND, 1xRCG, 3x DAM. Even with Hasten running I still have attack chain gaps depending on what I'm doing. However I found Build Up is not that great with /Fire because of the long animation times, FSC particularly has a nasty 2 seconds pause at the end of the animation which means that you can maybe manage 3 attacks max before it runs out.
I would have thought an offensively minded tnak would be one who concentrated on damage from an early point not just in the last 15 levels.
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For any tanker the big attacks are in the last 15 levels, before that yu have something nice but not the heavy hitter like Total Focus, Incinerate, Energy Transfer, Fireball, Cleave, Seismic Smash and so on..
You can pick Bone Smasher, Combustion, KO Blow asap, but you won't be 'offensive' anyway..
For offense roll a scrapper 
It's possible, I did it once but it was well and truly pointless. The fun of tanking is jumping into the middle of a huge mob shouting "leerrooooooooy nnnjenkins" (in your head DON'T TYPE it) and then taking a pounding and laughing at their puniness.
And after the team wipe sayin: 'Least I ain't chicken'
go play a brute muhahaa
like cybernight say, go play a brute, ^^
seriously, take a tank and change it into a "scranker" is not a stupid idea as long as your team know you're not a real "tanker".
Why make a blapper or a troller is less stupid than made a scranker??? that's the same goal no? change an archetyp
my only tank is a fire/fire
with fiery embrace/aim and hate, attack power good slot in speed and damage, it could be a good scranker (but it's not why i've make it ^^)
Powersets. That's why.
An Axe or Mace for a Scrapper/Brute would suit me just fine.
...is it possible to make a Tanker that focuses on offense?
It's just an idle question more than anything - for the life of me, I can't get into Heroes - but would be interesting to hear if anyone's successfully made an axe-wielding madman or the like.