The white ones are the lesser spirits that roam the realms and get aggressive if approached.
The red ones are always aggressive and seek out the weak souls and consume their energy.
The large one is Lily Flame, and a very powerful dark spirit. Her origins are part of a story line in season 4 or five of Cherry Tune: A New Tune.

The gargoyle. An crystal prep student in biology that saw what his classmate become and he wanted that power. He worked on a serum that would mimic that power, and he turn into a grey reptile like monster with horns and wings calling himself the gargoyle

Umarac and the Horsemen of Nebulon from COL.

Incognito from Hadesscream.

A few others