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I've been thinking about Dante picking up new devil arms that are similar to old ones during his time in the Underworld with Vergil.
One concept I had is some siblings to Agni and Rudra, utilizing earth and water instead of fire and wind. I'd name them Bhumi and Varuna, respectively, since those are also names of the same subcategory of Hindu deities. I even got some inspiration for their personalities while skimming the Wikipedia pages for the deities.
I think if Agni and Rudra are the middle twins, then Bhumi is the older sister, and Varuna is the baby brother. The Underworld is a harsh place to raise a family, so once their parents were lost, Bhumi basically raised her siblings. She can seem pretty reserved, but she's a force to be reckoned with if you cross her. Varuna is more playful and easygoing, but he's not a pushover either.
At first glance, you might see a clear parallel with the twins. Bhumi is the eldest, and very stoic, kind of like Vergil. Varuna is the youngest, and more wacky-woohoo, like Dante. But like Dante, Bhumi is the responsible one, while Varuna is more impulsive and promiscuous, like Vergil.
Perhaps their color schemes are even similar... I could imagine Bhumi having some magma-like properties when separated from Varuna. He helps her stay cool.
Obviously their weapon would utilize some mud-based attacks, but also I could imagine plant growth being involved, since earth and water are both necessary resources for plants.
Maybe the siblings reside in a forest? I'm humored by the thought that Bhumi and Echidna were girlfriends before the latter went to the human world and got herself killed by Dante. I wonder if Bhumi would hold a grudge...