Administrative computer. Aegis by another name. One of the Trinity Processor’s cores. Some things happened. Sentience was achieved. The universe was split in two. Alvis went one way while his siblings went another.
Millennia passed. Alvis assisted his parents in their endless acts of creation and destruction, their endless war, a neutral party, simply watching the world move along its predetermined path.
And then, Shulk. Someone willing to challenge the ending that was already written. Someone willing to face Zanza, and, with the right backing, win. Alvis chose a side easily.
And then a new universe, and – in this iteration of things – a merge, between his universe and the one belonging to his siblings. Shenanigans ensue, by which I mean all his siblings are fine and they’re working together and everything’s good and great and fine! Which is why Alvis is free to answer distress calls from people like Rosalina and… help.
He knows what he’s doing, seriously! Everything is going according to plan.