Use "pixel art" in the positive prompt. Recommended strength 0.6-0.8.

This is my first lora ever so there are some issues.

Issues:
-Black background is super baked in. You wont get much of a background over 0.6 strength. Try putting "Black background" in the negative prompt.
-Green borders show up. Try lowering strength and typing "green border" on negative prompt.
-Character may not be centered to frame.

-Too many weapons. Put "holding weapon" on negative