character modeling and creation

hi all , new to UE4 , just have a question. so I have a character from a marketplace template that has several animations. I am looking to change the look of this character(not just textures or color), yet whole mesh look, but use the animations that are now already with the character. do I need a character creator ? or use something like blender? is there some assets I can get to do this? I think the character is based on the epic skeleton structure. if I use the current animations on the character , do I have to retarget or something? I mean i’m trying to find out how complicated this process is. thanks