Colliders should be available for the template character already.
Issue is that in the new version 3.5 some things have changed in the body.ini file and we have not had time yet to change the wiki tutorials to match these changes.
E.g.
is added to the joints.
This allows to set the strength of the muscles for these joints.
Hence the head is hanging down.
The new character pack that has been added to the resource pack contains correct body.ini files.
Please use them to see the changes.