The First Chaka
The First Chaka started his adventure in what would be Chaka City. His memory of how he got there is uncertain, however he does know who he is. He manages to summon his TARDIS, build a sonic screwdriver, and go on adventures across the universe until he was tricked by his villains. He fell through the void and into The Nether, where he regenerated for the first time...
The First Chaka first appeared in Chaka Who #1.1, which started the adventure in what would be Chaka City.