Underfell Sans

Flowey the flower

.

Health Bar (for monsters) (+ sprites for monsters that I managed to make (3 + hard mode)).

The chances of monsters appearing:

Normal: 80%

Hard mode: 20% (after lvl 10)

Underfell Sans at the battle

Underworld Frisk

Don't

Sans at the battle

Core Frisk

Dusttale Sans