* Blue Lantern Corps (aka Blue Lanterns, Bringers of Hope): Those who bear the Blue Light of Hope have no formal hierarchy, and many call each other 'Brother' or 'Sister', not always jokingly.
One unusual ability of the Blue Lanterns is their ability to add their own Hope to a Green Lantern's Will. This effect takes a number of forms, but most often means that the Green Lantern is simply more powerful, creating stronger constructs and shields, flying faster, running out of power later, and so forth.
In the absence of a Green ring (or reasonably similar source), blue rings often have more limited abilities, though how limited varies somewhat from ring to ring. In general, flight, life-support (if the ring provides any), & basic defences always work, and healing of self or others usually does - indeed, Blue rings are on average the best for healing others. Constructs and offensive effects generally do not, or are limited to illusions. One important exception to this is when the ring-wielder is in the presence of large numbers of people all
Hoping for the same thing, allowing the user or users to perform far greater effects than would otherwise be possible.
Most Blue rings are able to sense the hopes of others, and to encourage them. This is often used in conjunction with healing.
A number of Blue Lanterns are therapy animals. The ring-spirit supplements the animal's own intelligence, as well as serving as a translator for those who cannot talk.
* Indigo Tribe (aka Indigo Lantern Corps, Indigo Lanterns, Blueish-Purple Lanterns, 'Who?' et cetra):
Nok.
The followers of the Indigo Light of Compassion are one of the less common Corps, and likewise are more obscure, not least because the colour of the Light they wield is often ignored in discussions of colours. They are also the Corps with the highest percentage of non-sapient members, particularly dogs.
Most Indigo rings are quite good at healing, second only to Blue. All Indigo rings can, with some effort, emulate the Lights of other ring-colours, so long as the wielder has the right emotion in great enough measure. Also, the rings grant a language to the Indigo Tribe that cannot be translated by any other ring-colour, or by magic, as well as making them supremely difficult to trace or track if they do not want to be.
Indigo Tribesfolk are often
too Compassionate, and likewise may be vulnerable to the Wills of others. Abuse of this weakness by Green Lanterns (and others) is rare, and
strongly discouraged, but does sometimes occur.
The default 'uniform' of the Indigo tribe is not particularly uniformal, being ragged, durable, vaguely tribal clothes (those who wear clothes at all), with tattoos and/or patterned hair (or fur) dye.
* Star Sapphire Corps (aka Violet Lanterns, Pink Lanterns, Purple Lanterns, Stalker Corps, Yandere Corps, et cetra): The ones who serve the Violet Light of Love seem to have little in the way of formal hierarchy, beyond Rookie, Star Sapphire, and Queen, the latter being held by the thoughtform Aga'po, who is an advisor, rather than a leader.
The Violet Light of Love is good for healing, often roughly equal with the Indigo Light of Compassion. A few Star Sapphires have demonstrated the ability to place a target in suspended animation within an ectoplasmic 'love crystal' (after which the victim will grow more strongly in touch with the emotion of Love- the more time in the crystal, the more in touch with Love they become, at the cost of other emotions). It is uncertain whether this is an ability that only a few rings have, or a matter of few Star Sapphires being able to muster sufficient Love to create this effect.
The default uniform is most often some form or swimsuit with boots and gloves, often very sexy, yet very tacky (these rings also tend to be better at permanently enhancing the wearers appearance and physical fitness, faster than the user could do it without magic, but still over a period of weeks or months for most people). Star Sapphires rarely recognize that there is anything wrong with the uniform while the ring is active. If they're lucky, this will be the only mental interference the ring produces. If they're unlucky, they can become dangerously obsessed with the object of their affections, with love in general, or both (hence 'Stalker Corps' and 'Yandere Corps'). The psychotherapy budget for this Corps is higher than any other, save for the Red Lanterns.
Male members are often mistaken for homosexual, regardless of actual orientation.
* Others
A few rings correspond to emotions not used in the comics, like Happiness, Sadness, Pride, Despair, and so forth. These lanterns generally do not have Corps of their own, but may find employment (and therapy, if needed) with any other Corps that's considered 'close enough.' If enough wielders of any one of these Lights join, another Corps might be spun off for them.
Rumours that the NGOs as a group, or some specific Corps (usually Green or Yellow) have a black ops division called '
The Corpse' are categorically denied, by said NGOs, by Time-Warner, and by the Inp-US, Canadian, Mexican, and other governments. They may even be telling the truth. There's no evidence, anyway.