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It seems that every class has access to 4 different Combat Allies, being able to assign one of them at a time for 50 Ресурсы оплота класса, helping you while outdoors in the Broken Isles. You can freely switch them around, unassign them to send them on missions etc., but assigning one will always cost Resources.
You can level your followers by assigning them as Combat Allies (at level 110, every quest and world quest gives 150 xp).
Combat Allies can be put in 3 categories:

Bodyguards: Pretty much the same as the bodyguards in WoD.

Will show up when you're on the Broken Isles (not in Dalaran or your order hall) and accompany you permanently.
Depending on the champion, will either be a pure dps, a tank (taunting every few seconds, but not necessarily holding aggro all that well), or a dps who will also heal you occasionally.
Classes without a tank spec don't seem to get tanking champions, I assume the same goes for non-healers.
Ranged dps will stand still while fighting, but they don't pull additional mobs even if they patrol right across them.
When bodyguards get killed, they will simply show up again seconds later with full health.
They will start attacking only when you attack something. If you get attacked by a mob, they will not automatically intervene. If you switch targets, they will switch a few seconds later. They will stop attacking cc'd mobs, e.g. disoriented.
Summonable allies: Can be summoned on a cooldown to help you for a short time.

If you have one of these assigned, you will get a button (Боевой спутник in the middle of your screen. You can drag that button to your action bars, same as the garrison abilities in WoD.
Will damage / debuff your enemies and/or heal you once or for a few seconds before they despawn.
"Random" allies: Will show up "randomly", but really when the internal cooldown is up and you meet a certain requirement (e.g. taking damage, so they will only show up while you're fighting).

When you're in a zone where the ally can show up, you will get a buff reminiscent of his ability.

None of the combat allies can be used while fighting a world boss.
Whenever you come near a world boss, bodyguards will disappear (but respawn when you move a few yards away). The random ally's buff will disappear and the summonable ally's ability will have no effect.

When you let your combat ally do most of the work and don't contribute enough dps, you might not get loot.

Rough dps/hps numbers for shaman allies (single target):

Name	Type	dps	hps	Notes
Герцог Гидраксис	Summoned	0	14k	2 min. cd (follower tooltip says 3 min.), when you use Безграничная квинтэссенция he shows up, heals you with Безграничная квинтэссенция and disappears. It takes about 2s between using the ability and the heal coming through. You can use it while stunned, but the heal did not remove the stun for me. I assume he simply removes all magic/curse/poison/disease effects. -> Full on demand heal+dispel every 2 min.
Предсказатель Нобундо	Random	5.5k	26k	When you take damage, he shows up for 30s with a cooldown of 90s. He will cast Быстрина on you immediately, then alternate between Молнияx2 and Исцеляющий всплеск. He will heal you even if you're at 100%, so not taking damage will not increase his dps. He will deal about 500k damage and 2.4m heal during the 30s he's active. -> Good healing and decent burst dps with a 33% uptime.
Буревестница Милра	Bodyguard	20k	0	Casts Молния, Выброс лавы and Земной шок at your target plus Рывок Клюва Бури for 130k AoE every 2 min. Because of Stormbeak, burst dps is higher than sustained, especially for multiple mobs (~40k for a 20s fight against 3 targets). -> High burst dps (for ST and AoE) every 2 min., otherwise decent ST dps.
Регар Ярость Земли	Bodyguard	26k	0	Uses enhancement abilities to damage your target in melee and Сокрушающая молния for 25k AoE every ~12s. -> High sustained ST and AoE dps.

All this has been tested by killing a few mobs (the same ones for every champion, no damage taken buffs etc.), so no big sample sizes. Char ilvl was ~840, follower ilvl 760 except for Hydraxis (830). All were common except Hydraxis (rare). I don't know if any of these factors influence dps/hps.

tl;dr: Seems like Rehgar is the best choice for a permanent dps bodyguard, whether you have a tank with you or not. Nobundo is a good alternative if you're playing solo and want some healing.

Комментарий от NewKasmir

This has to be some of the worst voice acting in the game. It's really terrible

Комментарий от paiway

Her name might come from the Swedish word "mullra" which roughly translates to "rumble", especially the rumbling of distant thunder.

Комментарий от Gaminghadou

For those like me who like to know what each of the Bodyguards can do, here is this one

Геомант Служителей Земли

His abilities are :
Player : Ilvl 905

17,2k dps

Молния : 27k
Выброс лавы : 108k
Земной шок : 32k
Клюв Бури : 138k, 30s cooldown, seems to be cast on aoe (too inconsistent, don't cast every 30s it seems)

No cooldown on spells but on a 1min20s fight (on her own) she did:
Молния : 16 times
Выброс лавы : 6 times
Земной шок : 8 times
Клюв Бури : 0, it was a single target fight