Edgar is a playable character in Final Fantasy VI. He is playable throughout the World of Balance and one of the required party members to be recruited in the World of Ruin. As a Machinist, Edgar wields advanced Tools in battle to attack enemies.
Edgar has very high physical stats, with Strength, Stamina, and Defense that are higher than average among the cast. His Evasion and Magic Evasion are very poor, and at 30 Speed he is tied with Gogo as the third-slowest character in the game, behind Cyan and Strago. His Magic stat is also subpar.
Edgar's unique abilities are divided between dealing physical or magical damage. Because of Edgar's greatly superior Strength over his Magic, and his magical options being subpar later in the game, it is optimal to train his Strength through level up bonuses.
Edgar is mostly geared to heavy equipment, with some light options. He begins with a Mythril Sword, Buckler, Leather Cap and Leather Armor. He can equip all swords, spears, shields, and heavy armor, as well as some daggers and hats.
For the World of Balance, Edgar's equipment draw is unnotable and none of his weapons offer any particularly important utility, though this is not a great concern as he'll likely be using his unique command set in battle instead of attacking. Conversely, in the World of Ruin, Edgar's ability declines in usefulness, and his equipment options become more important. As one of only two characters in the game able to use spears, Edgar makes a natural choice to build as a Dragoon, using the Dragoon Boots and Dragon Horn to perform multiple Jump attacks. Edgar's spears get a 3x damage bonus when using Jump as opposed to other weapons that have a 2x damage bonus, letting him deal heavy damage. Unfortunately his ultimate weapon, the Longinus, does not have this 3x bonus.
A downside to this is that beyond the Longinus, the best spears in the game are the Radiant Lance, which is won from Demon at the end of Kefka's Tower, and then the Holy Lance, which is innately holy-elemental. Thus for much of the game, if the party is facing enemies resistant to or immune to holy, Edgar's offensive utility is greatly compromised; he'll either need to equip either non-spear weapons that don't get the 3x Jump damage bonus, or the Partisan, which is comparatively low-powered in the more difficult areas of the World of Ruin.
Defensively, Edgar's equipment offers him good defenses but not much in the way of stat bonuses. The Royal Crown and Red Jacket that are exclusive to Edgar and Sabin provide strong protection with helpful stat bonuses, and Edgar also has the Genji Armor.
Edgar's unique ability is Tools, which allows him to attack enemies with various specialized weapons. The Auto Crossbow is acquired when Edgar joins the party, most others are sold at Figaro Castle. The Noiseblaster and Bio Blaster are sold at the castle when the party first arrives there, and also in the South Figaro weapon shop. After the Battle for the Frozen Esper at Narshe, Figaro Castle sells the Drill and Flash. In the World of Ruin, Figaro Castle also sells the Debilitator, but South Figaro sells none at all. The last two Tools, the Chainsaw and Air Anchor, cannot be purchased and must be found.
Edgar's Tools afford him terrific offensive utility in the World of Balance. The Auto Crossbow is strong enough to wipe out many enemy encounters in a single volley, and if the player finds the Hyper Wrist and/or Gigas Glove in South Figaro and Mt. Kolts, respectively, they greatly boost Edgar's physical damage and make Auto Crossbow even stronger. Against enemies more resistant to physical blows the Bio Blaster deals magical damage, and the Noise Blaster inflicts Confuse on all enemies.
Around the time of Zozo and the trip to Vector, enemies will become a bit too strong for Edgar to dispatch them in one attack, but Tools remains effective all the same and the Flash is another magical attack, very helpful against the enemies in the Magitek Research Facility that have high physical defenses. Additionally, the Drill and Chainsaw give Edgar the means to do great damage against single targets, and it is not uncommon to see him deal well over a thousand damage with them. With the Drill, Edgar can continue to pull his weight throughout the World of Balance.
In the World of Ruin, Edgar's Tools become far less effective. While the Drill remains a simple but viable option in most fights, a spell cast against an enemy's weakness will likely do just as much damage if not more, and Edgar's other Tools are simply too low power to be efficient. His "ultimate" Tool, the Air Anchor, is merely an Instant Death attack, which the Death spell can do the same and does not need to wait for the enemy to attack before it takes effect. The Debilitator's use is dubious throughout the game, as the weakness it afflicts enemies with is random and it may take several turns before they receive a weakness that is useful to exploit.
At this time Edgar must rely on the utility given by his equipment draw to keep up with party members who will acquire increasingly powerful spells and unique abilities. However, if the player intends to use him and keeps training his Strength via level-up bonuses, the Drill never becomes entirely useless and can still deal several thousand damage to a target without concern for defenses or elemental affinities.
Edger's Desperation Attack is Royal Shock, which deals magical damage to one enemy.
In the World of Balance, Edgar joins the party at Figaro Castle and is a required party member through the Lethe River. During the Three Scenarios, he is a party member with Terra and Banon. After the Battle for the Frozen Esper, Edgar is available as a party member for the rest of the World of Balance.
In the World of Ruin Edgar joins the party during the battle with the Tentacles in the basement of Figaro Castle. When the battle begins Edgar will automatically equip himself with the strongest weapon and armor in the player's inventory that he can equip. Once the Falcon has been raised, Edgar is optional as a party member for all other quests.
Because only Edgar, Celes and Setzer need to be recruited to acquire the Falcon, the player could hypothetically immediately enter Kefka's Tower and defeat the final boss using only them. This is known in the fandom community as a "CES challenge".
If Edgar is the current leader of the party, the merchants in Figaro Castle and South Figaro will give the party a 50% discount. The merchants in Figaro will protest if Edgar is in the party before doing business, but will not give the discount unless he is the leader.
If Edgar and Sabin are in the party together when revisiting Figaro Castle, when the party enters the courtyard a scene will occur of Sabin leaving the party to look around. If the party rests at the castle, this will trigger a scene of Sabin and Edgar's past. The scene has no practical benefit, it is entirely story related. It can be viewed in either the World of Balance or the World of Ruin, or skipped.
When the party meets Setzer, Edgar will attempt to use his royal status to bribe him to help them if he is present. Additionally, when Celes challenges Setzer to a coin toss, she will borrow Edgar's two-headed coin. If Sabin is also in the party, there is a brief additional line of dialogue where he reacts to realizing Edgar's deception with the coin.
Edgar and Sabin share a scene in the ending when the party flees Kefka's Tower. Thus if Sabin was not re-recruited, the scene will be different. Edgar, along with Celes and Setzer, also play a role in Relm's ending scene if Strago was not recruited.