Anime style movie about mutated people that gain murderous abilities such as projectile-shooting limbs and limbs with blades on the ends

Question

I saw this movie years ago when I was very young (too young to remember much). I can only remember parts of it, it is an animated horror movie, about mutated people that gain murderous abilities such as projectile-shooting limbs, limbs with blades on the ends, ect. due to a virus? parasite? I also think it takes place in the future. (but that might have been my childish brain seeing a police motorcycle and believing it to be high tech)

• There is a graveyard scene in the rain
• A small girl (maybe boy?) mutates and conjoins with their teddy bear towards the end
• There is a "final battle" with a giant mutant that ends with a big explosion and helicopter escape
• Towards the beginning a mutant with a "gun" for a hand shoots a police officer

Anything that could help me find the name of this movie is appreciated. Thank you.

Answer 1

This is most definitely 'Sin: The Movie'

Everything you describe matches what I remember from the video game anime adaptation:

• The graveyard scene in the beginning of the movie where it is raining.

• The story revolves around a small girl who has a teddy bear

• She is experimented on by SinTek later in the film making her a mutant

• There is a big fight at the end with a helicopter and explosions.

• In the beginning of the film a character named J.D. is killed by a mutant in the sewers (hence the funeral scene)

Answer 2

Could this be Akira? A virus causes a boy to go insane and develop psychic weaponry. There's also a teddy bear scene and an iconic final fight with a big explosion.