While running ansible using mitogen as the strategy_plugin, if you look at the process listing on the remote host (ps auxw) you can see the connecting host username and connecting host name in the process list.
Assuming your local username is LUSER and local host name is LHOST, you would see the following in the remote host process listing:
There is a new mitogen_mask_remote_name variable. You can set it anywhere convenient (mostly likely inventory host or group) and it'll cause processes to identify as python(mitogen:ansible). Let me know if you have any trouble :)