Magic Cube

It's been ages since I cracked my head to solve this so called 'Magic Cube'.

I bought these 2 different cartoon characters for my sons and guess what? I can't solve the cartoon character without missing the Tweety Bird's leg! And the Kitty Cat? Even worst! Gosh...somebody please S.O.S me before my son ask for it....

I know there are techniques to solve this puzzle..and I totally forgot since...well, my school days? So, please update me with the tips and tricks!