These are just my ideas behind the summons and how they can be updated to be a bit more useful? And unique among themselves.
Muse:
Phantom Sword:
Spirit Bond: [requires new special ability cast] Phantom Sword will take a moment to charge, but instead of attacking, it will generate MP for the summoner. [5% max mp restored]
Bonfire:
Mend: [requires new special ability cast] The bonfire will now randomly grant restore and mana restore to allies in it's cast area.
Salamander Flame & Mana Flame:
Purifying Flames: [requires new special ability cast] The spiritual flames will now randomly purify you of a negative status effect.
Earth Elemental:
Taunting Slam: [requires new special ability cast] The elemental slams the ground causing AoE damage and applying taunt with a 50% success rate.
Fire Elemental:
Slashing Wounds: [requires new special ability cast] The elemental charges for an extra potent double slash that applies 5 stacks of wounded.
Firegon:
Dazing Blast: [update current burn ability] Firegon has a 50% chance to 'daze' it's enemy, interrupting them. [duration .5 seconds]
Dragon:
Taunting Slam
Updated DoT on Fire Breath ability
Dragon's Blessing: [requires new ability cast] The dragon whispers it's blessing of dragon scale, reducing the damage allies take by 20% for a moderate duration [10 seconds]
Hawker:
Hawk:
Shocking Hawk [requires new special ability cast] inflicts .5 sec 'daze'
Update + 400/s burn to hawk charge ability. [dur 5 seconds]
Beast:
Stealth: When summon Beast will go into a stealth lasting 900 seconds or until attacks enemy.
Rend: update Beasts charge ability to apply a 500/s bleed for 4 seconds.
Dealer:
Mercenary:
Pierce Armor: [requires new special ability cast] Mercenary cuts at the enemy reducing their defense [10%]
Hunter:
Swiftness: [requires special ability cast] Hunter buffs allies with a 20% movement speed bonus.
Dread Knight:
Challenging Smash [update Knight's AoE ability to apply taunt at 50% rate]
Terror Knight:
Abyssal Spin: [update summons AoE ability to blind enemy for a short period] accuracy -80% for 5 seconds
Judgement:
Terrifying Dread Impact: [update Judgements AoE to have a 40% chance to mute enemies struck by it for 5 seconds]
Soldier:
new unique summon: Summon Dreadnaught
Top Traits: Attack Power, Defense, HP
Average Traits: Dodge, Critical
Low Traits: Magic Defense, Accuracy
Unique Ability:
Gore: Dreadnaught gores the enemy causing them to move slower [aspd 80% + mspd down 80%] for 5 seconds.
Big Pig: Dreadnaught slams the ground causing AoE damage and dodge down [10%] for 20 seconds.