Remember guys, we are trying to emphasize (EMPHASIZE) creativity, which directly implies originality.
I'll make my votes at the end of this, but I'll break down each specific stat for the Fire type.
format is HP / Atk / Def / SpA / SpD / Spe
Charizard: 78 / 84 / 78 / 109 / 85 / 100
Ninetales: 73 / 76 / 75 / 81 / 100 / 100
Arcanine: 90 / 110 / 80 / 100 / 80 / 95
Rapidash: 65 / 100 / 70 / 80 / 80 / 105
Flareon: 65 / 130 / 60 / 95 / 110 / 65
Moltres: 90 / 110 / 90 / 125 / 85 / 90
Typhlosion: 78 / 84 / 78 / 109 / 85 / 100
Magcargo: 50 / 50 / 120 / 80 / 80 / 30
Houndoom: 70 / 90 / 50 / 110 / 80 / 95
Entei: 115 / 115 / 85 / 90 / 75 / 100
Blaziken: 80 / 120 / 70 / 110 / 70 / 80
Camerupt: 70 / 100 / 70 / 105 / 75 / 40
Torkoal: 70 / 85 / 140 / 85 / 70 / 20
Infernape: 76 / 104 / 71 / 104 / 71 / 108
Magmortar: 75 / 95 / 67 / 125 / 95 / 83
Heatran: 91 / 90 / 106 / 130 / 106 / 77
HP: 77.25 average. Note that only one fire has HP above 100, and that one (Entei) isn't even OU viable.
Atk: 96.4375 average. Note that while there is a relative balance between high attack and low attack Pokemon, the only Pokemon that take advantage of Atk in OU are Charizard, Arcanine, Blaziken and Infernape, three of which are BL and one that is OU yet has its special attack emphasized more often.
Def: 81.875 average. Note only three Pokemon have Defense higher than 100, and only one of which is viable for OU.
SpA: 102.375 average. The best and most commonly high stat for Fires. At least 9 Pokemon can use this stat effectively in OU, though within those 9, only Heatran and Infernape are OU. Still, this doesn't mean anything...because only Heatran and Infernape are OU among the Fires anyway, lol.
SpD: 84.1875 average. Again, only 3 Pokemon have this stat at 100 or higher, and only one is OU viable. Still, the Pokemon you might more commonly see in OU, such as Heatran (restalk set is special defense), Infernape (I believe most Apes carry Hasty, though I might be mistaken), Ninetales, Arcanine (even), Typhlosion, Houndoom, Blaziken (even), and Magmortar, all have higher Special Defense than Defense, with some cases being even. The only three Pokemon that consistently have higher Defense are Moltres, Torkoal and Magcargo, only one of which is really viable in OU.
Spe: 80.5 average. All over the place here. Nothing especially noteworthy.
The important factors to consider, at least when viewing from the creativity perspective, are that HP is rarely high for Fires, Special Attack trumps Attack for Fires in the standard metagame, Special Defense trumps Defense for Fires in the standard metagame, Offense generally trumps Defense, and Speed is all over the place.
That's why I am SERIOUSLY recommended our Pokemon have high HP, with the Defensive stats being higher than the Offensive stats, the Attack stat higher than the Special Attack stat, and the Defense stat higher than the Special Defense stat.
4 factors to emphasize creativity, in order of absolute importance to creativity:
1.) High HP (most important)
2.) Defense > Offense, generally speaking.
3.) This is a physically offensive Pokemon
4.) This is a mixed defensive Pokemon, though emphasizing physical over special.
Here is my vote:
Offensive: Physical
Defense: Mixed (High HP, High Defense, Medium Special Defense)
Speed: Medium (It doesn't matter any which way, I would prefer to have lower Speed however so that we can emphasize the other stats.)
To recap: Creativity should be the most significant factor when determining our Pokemon! Don't let your personal bias affect what you "think" a Fire / Grass should be! Look at the standard metagame, and look at the common trends for Fires, and then make your judgments!
Also, for the people claiming that special has a more diverse movepool than physical....while this may be true, there is nothing saying that we cannot make moves (as hesitant as we are to do this), and it isn't by too much.
Special Fire moves viable in OU: Overheat, Fire Blast, Flamethrower, Lava Plume, Heat Wave.
Physical Fire moves viable in OU: Flare Blitz, Blaze Kick, Fire Punch, Fire Fang.
Special Grass moves viable in OU: Solarbeam, Grass Knot, Energy Ball, Leaf Storm, Giga Drain, Magical Leaf, Seed Flare.
Physical Grass moves viable in OU: Power Whip, Leaf Blade. Seed Bomb, Wood Hammer, Razor Leaf.
That's basically 12 special attacking moves (11 most likely since we will not be giving this thing Shaymin's signature move), and 9 physical attacking moves. The gap isn't as large as some people are claiming.