Digital Extremes once said they would not make genderswaps of Warframes, and if they did do male/female variants on a warframe's themes, they would be alternate takes on the concept.
They have since made good on this idea and I wanted to analyze and compare some of them!
Atlas / Citrine: Earth/rock
Ember / Nezha: Fire
Excalibur / Garuda: Blades? Up for debate but I like this as a pairing.
Volt / Gyre: Electricity
Hydroid / Yareli: Water/ocean
Khora / Harrow: Chains
Saryn / Nidus: Infested/toxin
Vauban / Protea: Grenadier/engineer
Oberon / Titania: Fae
But there are also some same gendered alt takes on the same concept too!
Loki / Ash: Stealth/ninja (this one at least can be chalked up to them not knowing what they wanted to do yet)
Revenant / Caliban: Sentient
Chroma / Lavos: Elemental
Valkyr / Voruna: Feral/animal
Not trying to draw any conclusions here, just thought this was an interesting thing to make a note of!