Secondary professions for a Paragon

Paragon Warrior
A Paragon/Warrior can act as an effective healer and buffer to the team, using chants like Ballad of Restoration', refrains like Mending Refrain, and shouts like "Watch Yourself!". Using these together, along with Signet of Synergy, and other paragon skills, a Paragon can be an effective group healer as long as his allies are around him.

Paragons only have two pips of energy regen, but Leadership can make up for the energy spent in Chants and refrains. If you are low on energy, use "Watch Yourself!" to generate some free energy. When using Mending refrain, use a cover chant to keep it refreshed, such as Anthem of Flame.

Try to use a low level tactics skill, so "Watch Yourself!" expires faster, refreshing Mending Refrain and triggering skills like Finale of Restoration much more easily.

Paragon Ranger
As with all other /Ranger combinations you get the added advantage of a pet which is always useful especially with a ranged attacker it gives you the chance to attack from range while your pet takes the damage and melees.

Ranger attacks do not work with Paragon spears and vide versa

Early on in Nightfall Storm Chaser can be extremely useful when running past the mass amounts of monsters on the map. You aquire Storm Chaser when you first select Ranger as your secondary profession in Nightfall

Paragon Mesmer
Mantra of Inscriptions combines well with Cautery Signet.