Neira.
Tamer Disco - Have him cut bones, Disco the Champ
Use your Archer with a Mana Leach, HLD, SSI, DI Comp Bow. Honor Her, Enemy of One, ARMOR IGNORE SPAM. Same way I take down rikktor. You will hit her for around 150-180 damage once your honor caps. Take about 20 minutes to fully drop her probably. Never actually TRIED With 1 toon, but I'm sure it will work.
Travesty, Just Dual Whammy. Can probably set up a simple follow sub and an auto attack sub on the travesty and run Twinkle McNugget's pvm Dexxer on your alt to handle the necessary subs. Use weapons with Hit area Effect and just lightning Strike her Over and Over and Over. Wraith form + Undead Talisman is best on her.
Grizzle - I think that a Greater Hyru thats fully trained is better than a greater on the grizzle..... I could be wrong on this, but I seem to remember hearing that/seeing a guy soloing it with a hyru. Same tactics as mentioned above.
Prism of Light- Disco Tamer and Archer. I Probably wouldn't even put your pet on the champ until its discorded, just jump back and forth between the teles until you get it. Then put your pet on it, Use your archer as back up to attack the Summons, BUT NOT THE CHAMP. Champ will throw out summons on top of your archer, which can be nasty.