From ErfWiki

Proposed Canon

Natural allies (or non-capital sides) are sides in Erfworld that have no capital, no cities and no royals.^Erf-b1-p079a They do, however, have their own treasuries and can form long semi-permanent alliances, or they can sustain themselves via mining, farming, hunting, and such. Rather than using cities, they can pop more units for their side via Moneymancy ^WoT-6051503.

Known natural allies sides:

• Hobgobwins (Gobwin Knob)
• Gobwins (formerly Gobwin Knob)
• Marbits (Jetstone)
• Elf Brands (unspecified member or members of the Royal Crown Coalition)
• Witches (Dagwood)
• Daemons
• Western Giants (formerly Jitterati, now Faq)

Racial Hatred

Some allies do not ally with a side at the same time as other allies; though it is unspecified if this means that they are unwilling to do so, or if they incapable of doing so.

For instance; Elves and Marbits will not ally with a side that has Gobwin, Hobgobwin, Witch, or Daemon allies.