Cid, the Helpful Adventurer

Cid, the Helpful Adventurer is the first hero in Clicker Heroes. She upgrades your click damage.

Upgrades

Upgrade	Unlocks	Effect	Description	Cost
Big Clicks	Lvl 10	Increases Cid, the Helpful Adventurer's Click Damage by 100%.	Cid has the unique ability to strengthen your clicks. Upgrade her to make your clicks more powerful.	100
Clickstorm	Lvl 25	*Unlocks the Clickstorm* skill**.	"I was surprised too, but it turns out we can upgrade these even further," Cid says. "I suspect you've gotten tired of clicks, though. Maybe you don't need this one?"	250
Huge Clicks	Lvl 50	Increases Cid, the Helpful Adventurer's Click Damage by 100%.	Cid's unique ability can grow in power, allowing you to click harder.	1000
Massive Clicks	Lvl 75	Increases Cid, the Helpful Adventurer's Click Damage by 100%.	"We make a great team," Cid says. "Let's get this upgrade and we'll be an even better team."	8000
Titanic Clicks	Lvl 100	Increases Cid, the Helpful Adventurer's Click Damage by 150%.	Cid looks off into the distance and wonders, "What could be bigger than Titanic?"	80000
Colossal Clicks	Lvl 125	Increases Cid, the Helpful Adventurer's Click Damage by 200%.	"Colossal clicks are bigger than Titanic clicks. We should get this one. I don't think there could be anything bigger," Cid says.	4.000e5
Monumental Clicks	Lvl 150	Increases Cid, the Helpful Adventurer's Click Damage by 250%.	"The final upgrade. These clicks are so big that every time you click, they build a monument to commemorate it."	4.000e6

Skill Name	Icon	Description	Hotkey	Base Cooldown
Clickstorm		Activates a temporary Auto Clicker which automatically performs 10 clicks per second for 30 seconds.	1	10 mins.

Cid is the only hero who doesn't get 4× damage upgrades (possibly because this would make click builds too overpowered). Therefore, she is completely useless to level up past 25 (at which point you would be able to buy the Clickstorm skill).
Cid doesn't benefit from Fragsworth, despite the fact that this Ancient increases Click Damage.
Some players have a bug with Cid gilds. She gets gilded with every new gild instead of a random hero who gives DPS, and it may be annoying in early game. (Bug save related, and representative with Steam/browser versions)
From patch 0.14 on, Cid's damage is affected by Hero Souls and Cid's cost is affected by Dogcog.

Cid is a possible reference to the recurring character Cid from the Final Fantasy game series, who appears in almost every game and assists the team in their quest.
During the Steam release of the game, Cid was depicted wielding a crowbar. This was a reference to the character Gordon Freeman from the game series Half-Life, which is produced by Valve, the owners of Steam.
Even though Cid cannot be gilded by conventional methods, there is still a gilded sprite of her. Perhaps she was, at one time, also meant to boost overall DPS, and not just Click Damage.
Cid is called Cindy in the French version of the game, Ekkja in German, Cira in Spanish, Alice in Portuguese. All these names are exclusively female names in their respective languages, unlike the androgynous english Cid.
Cid is the first hero to have a skill upgrade.
Fortuna's description mentions Cid: Cid walks with you to visit the monument. "Check this out," she says, and flips a coin. Heads. She flips it a few more times. Heads. Heads. Heads. "Every time," she says. A game of cards sounds incredibly tempting at the moment.
Prior to patch 0.10, her first upgrade's text read: Cid has the unique ability to strengthen your clicks. Upgrade him to make your clicks more powerful.
Cid and Yachiyl both have 7 upgrades each, the most a hero can have.

Heroes