Mugenne Kagemaru

Mugenne (also known as Female Mugen) is a potential future version of Mugen Prime where his regeneration somehow included a genderswap.

Appearance
Just imagine Mugen Prime as a girl and all will be okie-dey.

Biography
This Mugen's story is still being written, first and foremost.

So Mugen managed to sort out some emotional shit and managed to turn into an angry Irishman, which isn't stereotypical at all, just without the greens and shamrocks. And then he was gunned down by an army of robots because the person who betrayed him and left him for dead thought it would be one hell of a laugh.

Then he ran into himself when he first got the SHARDIS, and did a thing, and managed to screw over the Grim Reaper yet again.

But Death had the last laugh, as he made Mugen turn into a girl to please the Yaoi fanboys. But he forgot to change Mugen's gender identity, so he's still a guy inside.

Or maybe the Yaoi fanboys wanted that to remain. Hard to tell with those.

Mugen, or rather "Mugenne" as (s)he came to be known, was then separated from the SHARDIS, but after a run-in with Alien Kraven The Hunter, (s)he had to enter The Amazing Multiverse Race to recover the SHARDIS and managed to get some new companions as a result.