Giji>Tia
Got Lady and Myria's as well.
Lady>Isolde
Both of these ladies shatter stereotypes. Lady's a living incarnation of Malice, yet cares for her boyfriend slash guardian slash minion Killer above all. Isolde lost her lover long ago, but does what she thinks is right to avenge him and doesn't die for her crimes.
She also is lonely. One apprecative look at Killer's visage is enough to send Lady into a killing spree that won't end until Isolde is ground into dust. Do you think a mere teacher can stop a berserker Lady? *Snort*
Gijimu>Tia
Tia is better than Gijimu at speed, magical durability, skillset and status immunity. All Giji can do is hit things to brutal effect with his double greataxes. Tia's one real weaknesses is physical fighters in Light, and she's ran into the best. Even if Tia barely survives the first hit, there's nothing she can do to stop Gijimu from attacking and just killing her in the next swing.
Myria>Melfice
Melfice can: Battle Myria 3, and get his sword and Regenrator destroyed by Siricco and Holocost and go down swinging. Or he can battle Myria 1, and evade her physical with ease- well, he can. His accessories have no such protection. The sword's immunity to physicals does him no good, Myria 1 would much rather deal with Wailing Soul Slash than Quake and put up with Melfice constantly healing himself with the regenerator. Or he could go all out, kill the other parts of Valmar, and then battle against the titanic power of Merged Myria.
The only problem there is that turning into a giant Horn is likely to get the wrong kind of reaction from Myria and will get him dragged off to a fate worse than death. Methinks Melfice will take his chances with Myria 3 .