Wind 
Attacks an enemy 3 times, each hit deals damage equal to 15% of ATK plus 1% of max HP. Heals an ally's HP equal to 4% of the caster's max HP.
Each time Geb casts a healing ability actively, he passively heals the ally with the lowest HP. If a target suffers from a max HP penalty, restores the target's max HP threshold by 5% and applies 1 stack of Supporting Song. If the target's HP is below 50%, applies another stack of Supporting Song.
Supporting Song (Undispellable): Grants a percentage of base ATK boost per stack.
Each time Geb casts a healing ability actively, he passively heals the ally with the lowest HP. If a target suffers from a max HP penalty, restores the target's max HP threshold by 5%, clears Diseased debuffs, and applies 1 stack of Supporting Song. If the target's HP is below 50%, applies another stack of Supporting Song.
4 Reduces all allies' ability cooldowns by 1 turn, and perform a single-target heal 10 times. Each heal targets the lowest HP ally, restoring their HP equal to 6% of the caster's HP. Not affected by cooldown buffs/debuffs.
Passive allows team to get reduce HP ceiling back and applies supporting song
Skill 3 reduces cooldown of the team by 1 turn and heals
Good in Tower against max hp ceiling reduction units and boost team damage over time with supporting song
Strong in fafnir due to skill 1 multi-hit
Can only cleanse disease
Damage is lackluster
Heal is random at times and doesn't heal as much
Ahmed (Geb) is a 5 stars Wind Support esper in Dislyte.
Ahmed is more of an offensive version of Clara and also thrives in long battles due to his passive supporting song. His passive can reverse the effect of max HP ceiling reduction effects, making him extremely useful against Fafnir and espers like Luo Yan and Hyde.
He has 3 hits on his skill 1, which helps break the shield of Fafnir. If your ally is frozen and max Hp ceiling is applied, he will remove it over time. He will also remove the anti-heal debuff, which will help your ally survive much better. His healing always targets allies with the lowest HP, so you cannot select who to heal.
His skill 3 heals the entire team and reduces everyone's skill cooldown by 1 turn and is not affected by other skills that increase or decrease cooldowns. This is great, especially for allies that have low skill cooldowns as it will enable to to spam their skill more often.
The sword avatara set is very good on him, as when he counters, he will heal an ally and also reduce the max HP ceiling penalty if they have it.
Ahmed is a staple in Fafnir. He has 3 hits on skill 1 and since his skill 3 has a long cooldown, he will use skill 1 most of the time. When Fafnir applies his max HP ceiling penalty, Ahmed reverses it.
As for stats to focus on, I suggest:
Here is an example run that you can see him helping Tang Yun survive. He also improved my Fafnir 10 auto success from 30-40% to about 80%.
Wind Walker x4
SPD +25%
Adamantine x2
All allies start battle with a Shield equal to 15% of max HP. Lasts 2 turns.
HP%
HP%
SPD
Wind Walker x4
SPD +25%
Sword Avatara x2
Grants a 25% chance of using Counterattack upon taking damage.
HP%
HP%
SPD
Ocean Waves x4
Grants 30% chance of reducing all ability cooldowns by 1 turn at the start of each turn.
Sword Avatara x2
Grants a 25% chance of using Counterattack upon taking damage.
HP%
HP%
SPD
SPD
DEF%
RESIST%
| Level | Atk | HP | Def | Spd |
|---|---|---|---|---|
| 1 | 249 | 4382 | 207 | 94 |
| 60 | 15948 | 910 | 754 | 94 |
| C. Rate | C. Damage | Acc | Resist |
|---|---|---|---|
| 10% | 150% | 0% | 20% |
Basic Wind Wave x15
Basic Wind Wave x20
Basic Wind Wave x25 
Elite Wind Wave x10
Elite Wind Wave x15
Elite Wind Wave x30