Second skill could probably be named "Ice Siren" if you wanted to. The current way would be cute though!

As for the first skill, in order for it to not be a complete clone of the seraphynx laser, what if the sprite followed behind the player while attacking? If not keeping up with the player, it could move at a reduced speed behind the player while attacking. You would have a little freezer firing in front of you, or else you can activate your sprite and it will follow the path you went on. Would make it a bit more unique!

For "performance", I'd also reckon to make that bit of skill 2 increase the "dance" duration.

I like the sprite idea, and will agree that Moonstone needs to be used and a freeze sprite is a good way to go with it BUT this sprite would be, imo, quite clearly the strongest of the four sprites. It maybe needs some changes to even it out.

"(Awaits someone to name Rigo elsa)" - Who's Rigo?

"Frost breath, like seraphynx' ray of light, however it freezes anything it comes into contact to, damaging enemies of course." - Why not make it like the Dust Zombie breath but shorter ranged? Also dealing damage while freezing them is OP, because they can't escape the damage. This skill would be superior to the Seraphynx's version in every-way. I think it should either be a very low freeze chance or not deal damage (or possibly it deals damage until they're frozen, with a really low chance of inflicting freeze). For one of the ultimates she could pull mobs in with the breath.

"Colder: Increases the length of freeze" - With what I said above I just want to clarify I don't think this should be changed to freeze chance.

"Appearance wise...I'm pretty lost" - Maybe Elsa could look like a yeti or some kind of Arctic-based animal (just not a killer whale...). Maybe she could have a parka. xD

"Ice skating, Rigo goes 5 tiles in the characters direction and draws enemies in, then freezing them where they stand." - Sprites secondary abilities are always defensive based. Not only would this skill be slightly superior to both Sera and Masker's 2nd abilities but this would be so easily spammable in even a 2 person party enemies wouldn't be allowed to be enemies, they'd be crowns that you have to hit to get. Considering that the current final boss is fire so freeze is already the most effective status in the game, it cannot be allowed to be made so easily spammable. This ability would rule all freeze weapons out of the game by rendering them useless to all those who either restart for, or have the crowns for, Elsa.
My personal idea would be purely drawing them in and not inflicting status for this skill, however if the player attacks it breaks the spell. Maybe call it "Snow Spell"?

"Skill Three: Endless Winter, Rigo screeches and enemies anywhere near are both frozen and damaged gradually." - Once again superior to the other sprites. If you have Elsa to freeze the enemies, why do you need Sera to protect you? I do think it should induce status and inflict damage (as most 3rd skills do)

"Rigo breathes in to drag in enemies, then yells and enemies are scattered, being frozen." - Rather than being an ultimate skill I think that would make a perfect 3rd skill for Elsa.

"Rigenomnes (or "Elsa" for short) is pretty balanced." - Players will and can abuse freeze too easily. Freeze weapons need to be weaker than fire, poison or no-status weapons as people can launch charged attacks easier in the freeze time. Most players either use an Autogun, a Shivermist or a Glacius. There's a reason they don't use Ash Of Agni (although they may use Combuster) or Vile Veiler (is that it's name?)(there are no non-status mist bombs). Also most players use the non-status line of the Autogun because they'd rather give the damage than have poison or fire. If there were a freeze Autogun you wouldn't be able to play Ice Queen without having the 1 person who brings it anyways, despite how pointless it is, because they say "It's a good weapon".

"I do agree it needs to be different from a ray of light, hence I think it should try to move around while attacking." - Then either Ray Of Light or this would become completely worse (depending on whether the majority of SK players view moving as a good or bad thing, I dunno what players think regarding that but I'm pretty sure the other one would be criticised enough for people to stop using it). Not only that but I think my suggested change would be more relevant to the name of the attack.

"Ever see what happens when an enemy walks into a ray of light? They stop moving and just sort of ride the ray." - Freeze holds people alot better in one location than Sera's laser. Mobs can walk out they just find it harder to move while being hit. Not only that but it continuously pushes mobs away from it (I personally think that's the best thing about the skill), whereas the freeze holds them in place to be hit again and again. Although I have already said I don't support the moving around, it would make the freezing fairer.

"Perhaps 3 seconds of the dance for standard, and 6 seconds for full." - Considering that as the freeze strength levels up it'll go up to 6/7 seconds there will be around 12 seconds freeze time (firing time + freeze effect time). That's plenty of time for the party to move back and charge their weapons in order to destroy the whole room. No-one's going to use that defensively, they're only going to use it to hold enemies in one place to use their Blitz and Combuster charge attacks.
Also back to the usage time, with harnesses and upgrades the charge time can drop quite drastically and 50 seconds is alot more than it would take to recharge, (I'm not directly sure as I never end up buying harnesses) maybe taking around 35 seconds. If 4 people all have Elsa then that's 48 seconds usage time, 35 seconds charge time. That's 13 seconds free time where all sprites are ready to fire again but have no reason to as enemies are already frozen. Even if it took 50 seconds to charge back up you have only 2 seconds of unfrozen time if the team times it well.

"Seraphynx's angelic aura is very weak." - It's very effective vs weaker mobs. Minis are actually very deadly and alot of players find them difficult but angelic aura is one of the best things to use to fight them as their attacks deal too little damage to do much to it and this allows you to hit them while they're useless.

"From 7-12 tiles, it inflicts minor." - 12 tiles is a bit....much...for a freeze....especially if it deals damage. Even if it's both weak AND minor freeze...12 tiles is too much.

Looking back at this sprite I stand by it being ridiculously OP. So many different weapons would be made pointless by this sprite. Something to note about the other sprites is that there were no alternatives to their attacks when they were released. This sprites abilities really just seem like super-shivermist to me. I don't see any real advantage of the shivermist over this sprite and the fact that they're comparable overall isn't a good thing.
Also, having a full status inflicting set of abilities is Drakon's only advantage over the other two. This sprite should only have one or two freeze abilities overall (because Drakon is already worse than the other two sprites, let's not destroy the one strength it has).
Not only that but I think the 12 squares suggested by Fangel for the range of the 3rd skill is stupendous. It seems to me that a low chance to freeze 12 squares is wholly better than any other sprite ability so far.
Lastly; thinking about it the game doesn't need a new sprite yet, especially one that's arguably (I personally think it's obvious) stronger than the other 3. The game is already far easier than it used to be (crafting generally costs less, weapons are stronger, the gunner update meant that weapons, helms and armours alike are now inarguably better, there are sprites in the first place to increase damage output and there are more vial types (the knight-summony-thingy, spinny-orbs and artillery)), so why make it easier? If anything the developers need more levels, enemies and attacks (as in the attacks enemies launch...new ones can only help to surprise players and force a tactical response).

None-the-less the Maskeraithe's normal shadow cloak doesn't have any status, that's just an ultimate. Drakon is the only sprite with all 3 status inflicting before ultimate.

@Dusk-Satoshi
When fully upgraded the first skill probably has less cool-down than the Shivermist (including harness).

@Dusk-Satoshi
Cool-down should definitely not be the only thing that gives Shivermist the edge in the first place. As I've already said a party full of people makes the cooldown next to pointless, and if all maxed out even the advanced skills wouldn't have cooldown with 3 people. The only other sprite ability that has a comparable attack to a weapon is Drakon's 3rd ability with the Combuster, but the Combuster not only has the lower cool-down, it also does way more damage. Your ability does not have both of those downsides and is therefore superior to the Drakon 3rd skill.

Make the pod craftable = less money for OOO.

My 3rd point I made; "Lastly; thinking about it the game doesn't need a new sprite yet" - The game is too easy. It needs toughening up before making things easier.

The game is easy for players who know what they're doing, learn patterns, all that. A new player might need that crowd control, and end-game itself can change up a bit from a new sprite.
The game didn't get harder when battle sprites were added to go with the whole "battle sprites are here - gotta balance that out!". Gunner update didn't make the game harder. The game doesn't need to get harder to introduce a new sprite.
Besides, for things like Grinchlin Assault and March of the Tortodrones, wouldn't a sprite based on control make those levels a bit more fun? It's not fun to die to a tortodrone 17 times in one sitting. It is, however, fun to die maybe once or twice and make it off by the skin on your teeth. Maskeraith is the sprite that lets you take a timeout while dooming your teammates. Rigenomnes would be one that helps your party rather than just yourself.

It's better to have a new sprite that people can level up and get used to using and then introduce content that makes that sprite super useful than it is to force everyone (who has the money) to attempt to power-level a sprite after content comes out (at the same time) for the sake of the new content. One of Spiral Knights' biggest issues is that it goes by too fast, so why not lower it down a notch while keeping the game fun?

That other wolver/snarby sprite that Dusk has come up with would be a great side-by-side release with this sprite, but with too much stuff happening in one thread it gets a bit cluttered. Instead of saying "This sprite is good! ... But only if all these other strings are attached", take the suggestion at face value. It's up to Three Rings on how things are introduced, and I'd love to see a sprite such as this one at any point, as long as it's not locked behind a paywall (looking at you, prize boxes).