Wizard 101 allows players to go one on one (or four on four).
KingsIsle Entertainment, the developers of Wizard 101 has announced a plan to allow players the ability to lock horns in PvP. The game is not changing to a PvP-centric game, the development team is just adding another layer of fun that players can have with completely consensual PvP. If PvP is not your thing, don't worry. This doesn't appear to be some tacked on dueling system though, as Wizard 101 will have team battles of both ranked bouts and non-ranked levels. The idea is that players will use the non-ranked version for practicing and then join the ranked battles which are queued up via a matchmaking system.
The announcement makes it very clear that Wizard 101 is sensitive to its audience of a younger generation, and there is no blood or death in the game. The game continues to cater to its rated audience of E10+. As a matter of fact, Wizard 101 has received the 2008 Parent Tested Parent Approved Media Seal of Approval. From free to play areas to premium subscription services offered at $9.95/month, Wizard 101 is certainly worth a look.