I'm going to list my monsters. If there are any that are not worth keeping/leveling please let me know.
(SNIP)MONSTER LIST (SNIP)
A good rule of thumb is that anything "Dragon" is a keeper, or an easily identifiable evo material (emerald, ruby, metal, gold, sapphire...)
Beyond that you are on your way with the Succubus, Angel and the Dryad (Succubus's last evo material is dark keeper). Angel and Dryad kind of have the same nitch, but they would be nice to have depending on what the rest of your monster team is.
The demons/devils are low level attackers, I personally
focus on one of them to get it to skill up. Their low health means that they may be used in resolve teams but not many other places.
The golems/gaurdians/mech warrior are great for HP and damage control. use as needed depending on color.
The technique knights? I can not find a use for them personally so they might be good evo fodder. feed them into low level carbuncles (or Pendras) and then those into whatever you are leveling.
6 Sm Blue Masks Can I use these in place of the glow worms for the resolve team?
Yes, 10 hp works for keeping hp down, but they have 70 less RCV, so that is more recover that you need from the healer leader.
Also you are floating way to many small masks, those are very easy to obtain and you really don't need that many at one time.