Leto - Galileo88/Galileos-Planet-Pack GitHub Wiki
This is one of the three most difficult bodies to prepare advanced surface operations for; though it is not also H-class (the most unfriendly to colonists) the others being Thalia and Catullus. Leto shares a distinct lack of crustal resources like Thalia, but not as extreme. As bodies at this distance are expected IRL to contain little more than ice variants it's reasonable to suggest that it may not be worth it to arrange any manned mission for this planet (ignoring the time it would take to get here and back). Nonetheless, there are benefits to sending probes and even kerbals this far out.
Leto's orbit size is comparable to that of Plock and Karen in the Outer Planets mod.
Flags
The loneliest planet Leto doesn't qualify for its own flag but shares the Ice Life flag as a member of the ice body region with Hox and its moon Argo. This flag, though not a champion flag can possibly be used that way.