How to do the effect of picture,the effect on Game character’s hand?
Particles.
Looks like actual geometry to me. Notice the lines around the outside.
Not necessarily, it can probably be accomplished more easily and more efficiently with a curved mesh and an additive particle shader with either UV animation on the texture or by offset movement, depending on the texture’s structure. Not all special effects are particle effects.
Edit : Reply was aimed at the 2nd comment, I commented almost the same time as Marigold, didn’t see that reply.