Ash:Ash is a below average Inferno hero.
Axsis:Axsis is another below average Inferno hero.
Ayden:Ayden is the best Inferno hero there is, and he's also one of the best spellcasting heroes in the game because of his enhanced Intelligence.
Calh:Calh is a weak Inferno hero. His Scouting is really bad and Archery is not powerful as well since the Inferno has only one type of ranged attacker. In small maps he could be useful to launch a fast campaign with lots of Gogs.
Calid:Calid is an average Inferno hero but you should always recruit her as a supporting hero since her specialty makes her even more valuable than a sulfur mine.
Fiona:Her Advanced Scouting makes her a below average Inferno hero, but her specialty is still quite useful in small maps.
Ignatius:Ignatius is an average Inferno hero. Tactics does miracles for Inferno armies, but Resistance is not super, as is his specialty.
Marius:This is a hero that is definitely worth recruiting in small maps, the Advanced Armorer and her specialty can really make a difference. (only in small maps)
Nymus:Nymus is like Marius an above average Infero hero, her Advanced Offense and her specialty are very useful in small maps. In any other size of map, she is not that good.
Octavia:Octavia is nice as a supporting hero because of the 350 gold per day. Other than that, she is a below average Inferno hero.
Olema:Olema is an average Inferno hero.
Pyre:Pyre is a good garrison hero and is not that bad to do offensive actions in small maps either.
Rashka:Rashka's specialty is all right but Scholar is not, so he's only an average Inferno hero.
Xarfax:His Leadership makes Xarfax a good Inferno hero, but unfortunately his specialty is rather weak.
Xyron:Xyron is a below average Inferno hero, though his specialty might be useful in small maps.
Zydar:Zydar is one of the best Inferno heroes and definitely also one of the most powerful offensive spellcasters in the game.