Ill take a shot for tau. They don't have as many basic troops as other races, so its a bit tougher I think. Fire warrior is the obvious one. Vespid would probably be their jump pack troop type. Pathfinders might have to be shoehorned into a medic type role, although they might make a good hero choice with buffs for your allies, like the other heroes offer. I would like to see kroot in the "close combat" role, and stealth suits in another. I imagine the terminator equivilents would have to be crisis suits, though making crisis suits one of the basic classes and having broadsides be the upgrades would be pretty sweet too. Necron would probably be added soon too, but I don't know as much about them so will leave it open for others.
Fire warriors as tactical for sure I can see the Kroot making an interesting skirmisher pet class(melee) I could see the XV25 stealth suit as a heavy Might be a stretch, but the Ethereals could be a medic/buff/support type. Otherwise Pathfinders could probably fill the role. Interesting if they were allowed rail rifles as well(sniper medic) Vespid seem like they'd be hard to implement, with limited weaponry and the ability to fly(not like a jump pack)
Tau Range Grunt: Fire Warrior. The usual bread and butter stuff primarily effective against infantry. Assault: XV-15 upgrades to XV-25 Stealth suit( instead of using a jump pack to close the distance and engage with close combat weapons, they use the stealth option to get in close, leap over the defences and fields of fire striking at close range with Fusion guns and burst cannons within or behind the enemy lines. They could also stay with the Firewarriors and act as support depending on what weapons they take. Recon/AT: Pathfinders take to the field boasting sensors, jammers and strategic beacons useful for helping to clear a fortified position by hindering the enemy's abilities or by taking railrifles and emp launchers to support the FWs by picking off enemy armour. Good at being used for disrupting enemy supply lines etc. (less health than FWs and cannot use pulse rifles or proton grenades, pitiful in close combat. Heavy: XV-8 slow with only a jetpack to help in manoeuvring, the XV-8 is considered a great asset in open warfare and helping to reclaim enemy hard points. The suit is capable of taken two weapons and has a third spot reserved for a piece of equipment, although a walking powerhouse when it comes to the amount of outgoing fire it is capable of, pilots of the XV-8 will find that even with their heavy armour their size is the downfall of the beast. unable to take cover behind anything short of a building, the XV-8 fails by having pitiful close combat defence unless opted for it (flamer) Elites: Kroot shapers, Stingwings, Fireblade. Characters: Farsight clone, etc
Tau: Fire Warrior - Med-range infantry, anti-infantry weaponry, light anti-tank Kroot - Med-range infantry, anti-infantry weaponry, melee prowess, can evolve flight capability to resemble jump infantry XV-15 Stealth - Short-range heavy infantry, stealth, can sidegrade from anti-infantry weaponry to anti-tank weaponry and/or bigger suit with more armor/hp Pathfinder - Short-range infantry, acts as support class with markerlight buffs, can sidegrade from buffs to long-range weaponry Heroes/Elites: Kroot Shaper, XV-8 'Crisis' (with anti-infantry, anti-tank, or buff patterns), XV-88 'Broadside', Ethereal, Vespid Stingwing, Gue'Vesa (human, or any other race, that joined the Greater Good) And my other favorite tabletop army Imperial Guard: Guardsman - Med-range infantry; start with choice of special weapon (cuz flashlights are terrible); can sidegrade from special weapons to deployable, stationary, heavy weapons Stormtrooper - Med-range infantry; start with hotshot flashlight (more armor pen == more dmg); IIRC, there are stormtroopers equipped with jump packs, but I don't recall if this is for jumping or deep striking; stronger armor/hp than Guardsman; bigger knives for melee dmg == Nob Officer - Short-range infantry; support class; buff larger areas of friendly infantry depending on # of medals/wargear equipped; pistol & melee weaponry To offset the IG's glaring weaknesses in the armor, hp, and infantry-damage departments, they should have the largest selection of vehicle customizations and/or lower vehicle cooldown timers Heroes/Elites: Commissar, Ogryn, Demolition Guardsman, Unique Sniper, Planetary Governor, Kasrkin
The Tau don't really have anything capable of being an equivalent to Terminators/Wraithguard. The armour and shields could provide that it isn't insta gibbed but its large size means it won't be able to dodge fire or hide in cover to become super un-killable. I'm thinking more in the lines of Asymmetrical balance rather than lets give the Stealth suits heavy armour and buff them to they're on par with TDA. Also the Elites could be reserved for things like the XV-9 and other suit varients.
For Tau: Fire Warrior in the tactical role. Kroot or Vespid in the assault role. XV-15 Stealth Suit in the heavy support role. Though you could have a XV-25 in this role with a caveat. Pathfinder in the medic-type role. As for an Elite, either the XV-25 or if that's being used for the basic heavy a XV-22 like Cmdr Shadowsun wears. XV-8 & XV-88's should be upgrades to the Elite, possibly even Veteran classes.
Tau Basic classes -Fire warrior (tactical, ranged focused) -Pathfinder (recon, sniper) -kroot (melee) -XV-15 (upgradeable to XV-25) Stealth suit (ranged assault, stealth) -Gue'vesa - basically guardsmen with better tau equipment (tactical, balanced support) Elite -XV-8 Battlesuit Heroes -Vespid Stingwing -XV-22 Stealth suit Necrons Basic classes -Immortal (tactical, ranged) -Wraith (assault, melee) -deathmark (sniper, assassin) -Triarch Praetorians (heavy melee) -Cryptek (support, mech) Elite -Lichguard Heroes -Necron lord -Pariah
Dark Eldar ( More then just spiky Eldar) Basic Class Kabalite Warior (ranged focused, bread and butter unit) Wych ( Assault/Melee, Anti Vehicle (haywire goodness)) Wrack/Acothyst with Hexrifle ( sniper) Elite Incubi ( Heavy melee - trade off no range) Kabalite Trueborn ( Heavy ranged weapon, or Med ranged anti Mech) Hellions ( Jump Pack, Iconic dark eldar unit. Would be interesting point of difference instead of Scourges ( the dark cousins of Eldar Swooping Hawks), only down side is they don't 'land' as such. Haemonculus ( Healer and Buff) Mandrake ( stealth unit) Heroes Archon - tooled how ever you like, could be interesting if Clone or Shadow field are used to balance out lack of armor. Talos - just cos Vehicles Venom - Light an fast , two sets of gun ( mainly Anti Inf) Ravager - the "heavy" vehicle choice. ( I dont think the raider is needed as its only a 1 gun vehicle and primary troop transport) well just my 2c worth