Ifni said:
This looks like fun

Okay, let's go through my currently-in-play 3.5 characters. I suspect that at least one of these is trivial to convert, and at least two are very difficult, but we'll see what others think.
Wow. That's a lot of information. I'll see what I can do.
1. Sounds like we're going to start with a cleric using the battle cleric build. The chosen foe of evil outsiders makes it sound like you'd want to use the Radiant Servant paragon path, because its Solar Wrath power and Lasting Light feature both make you more dangerous to undead and demons. Clerics are proficient with the quarterstaff by default, and whether the strikes are a single powerful blow or a series of quick jabs is a question of flavor. Sentinel Strike(17), for example, does 3[W]+str damage, which we can say is three hits in rapid succession. The cleric has a good amount of healing and empowering spells, the latter of which we can consider as holy rage.
The cleric has a few powers that directly involve flame; Purifying Fire(15) sounds like it would be perfect for this character. If you find that you're not getting enough firepower out of cleric abilities, you can multiclass into warlock or wizard to pick up a little more. I think rituals have you covered the rest of the way. Cure Disease for healing the sick, Traveler's Feast for feeding the hungry, and Phantom Steed(with some heavy reflavoring) to ride the wind.
2. I'm thinking wizard primarily. She and her friends can fly with Mass Fly(22), she's got good access to freezing mists like Freezing Cloud(1), blinding dust clouds with Wall of Fog(6), and the dark shadows of her nightmares with Evard's Black Tentacles(19). We can reflavor many spells with the conjuration keyword to be spirits of the dead rising to protect her, and cantrips, especially Prestidigitation, cover several of the minor effects mentioned. Magical protection from falls is covered by Feather Fall(2), and Displacement(16) can make luck go your way.
For some ways to help your allies show off, you may want to multiclass into warlord. While a warlord can't teleport allies into position, they have a few powers that move allies around the battlefield, like Steel Monsoon(3) and White Raven Formation(16).
Rituals can give you some of the effects not yet covered, like Knock and Phantom Steed, and the knowledge skills have been lumped into Arcana(and maybe a little Religion), so acquiring those won't be hard.
There are a few tricky things. I don't know of any ability that outright stops spells as they are being cast. The closest I can find at the moment is Shape the Dream from the Wizard of the Spiral Tower paragon path, which only works on attacks that have hit your will defense. There is also very little spell reshaping(with the exception of walls, which can be shaped a number of ways). The epic tier feat Spell Accuracy is able to adjust which regions are hit by spells by a little bit. Limited Wish is pretty solidly out, and the only abilities I've seen that redirect incoming attacks belong to defenders, who draw the attack to them.
2a. This guy's going to require some fairly heavy reflavoring however you choose to approach him. With that in mind, you can start with either of the leader classes, as they both have the ability to provide bonuses to attacks, damage, AC, and saves. I'd recommend cleric for the regeneration-like effects of Consecrated Ground(5) and Purifying Fire(15), and the weapon-boosting Weapon of the Gods(5).
For the striker-controller abilities he carries, he can multiclass into warlock or wizard. I don't know if either one will provide him with all the abilities he wants, but I think he can get most of them.
3. Totally a striker. Ranger's your way to go here. Given the amount of movement you want to be doing, the Archer Fighting Style is probably your best choice, giving you some extra AC vs. opportunity attacks. Crank up your mobility with Undaunted Stride(10) and Longstrider(16). Select the ranger powers that can use any weapon, like Evasive Strike(1) and Attacks on the Run(9). Round out your power selection by multiclassing into paladin for some radiant damage(to which undead often have a vulnerability) based off of your weapon. Martyr's Retribution(5), for example, is quite good for this.
Keen eyes and ears are covered by the Perception Skill, as is tracking.
4. Most of what you want here is in the realm of the warlock powers. Becoming airborne through Cloak of Shadow(16), becoming tougher with a Shroud of Black Steel(6), cloak yourself in shadows with the Shadow Walk class feature, jumping through shadows with Ethereal Stride(2), conjuring up clouds of blinding dust with Hunger of Hadar(5), and so on.
About the only things you can't pick up with warlock are the abilities to create illusions, which you can manage with the Hallucinatory rituals, the ability to see in the dark, which can be picked up by an item(Goggles of Night), and providing flight, speed, and extra attacks to your allies. Given the way you contrasted the allies flight to your own flight, I'd use Phantom Steed for that(it'll take a while to get your Arcana check up to where you can get a 40 reliably, but it can be done), and get the other abilities by multiclassing into warlord.
And for the gnome becoming draconic part, I'd recommend using dragonborn racial traits and the appearance of a gnome. Alternately, if your GM is up for it, start with gnome racial traits, and every time you gain a utility power exchange one gnome racial trait for a dragonborn racial trait. That option isn't supported by the PHB, but I felt it was interesting enough to be worth mentioning anyway.
5. I'm gonna work this one kind of backwards, because the "forked lightning bolt" strike with the lance sounds like it will be most difficult to make happen. Fortunately, there is a paragon feat that is directly on point called Lightning Arc. So now we need to gather some lightning-based attacks to use it with. The lightning and weapon keywords rarely appear in conjunction, but they do occur in two cleric powers: Arc of the Righteous(13) and Holy Spark(15). So you'll need to at least multiclass into cleric. You may want to take cleric as your primary class, depending on how many self-buffs and how much healing you want. In either case, ranger makes a good choice for your other class, as it provides some good mobility and some other attack options. If you want to be able to make airborne excursions, you can get some flight abilities by using warlock or wizard for your non-cleric class and flavor your flight as riding the bat.
Full rules for mounts are not in the PHB, so if you want the bat to be an actual mount, you'll need to work things out with your DM.