Some door sprites I could find for you:
* you may need to manually change the angle of each sprite to 90/270(?) degrees though....
=> source here: https://opengameart.org/content/lpc-animated-doors
* you may need to manually remove that mugenized GGXX Faust body parts though....
=> source here: https://onedrive.live.com/?authkey=!AHiQCBHj6az5zwg&id=495747B6F9328805!125&cid=495747B6F9328805
* you may need to manually change the angle of each animated frame...isometric view change?....though...
=> source here: http://hellknightdan.deviantart.com/art/Door-sprite-opening-288371806
* you may need to manually clean the door sprites though....
=> source here: http://m.shutterstock.com/images/479052241
A piranhas sprite sheet I could find for you:
=> source here: http://spritedatabase.net/file/5543
A "
P2 falls into a place where attacked by..." MUGEN reference I could find for you:
- in case giphy not working for you...:
=> source here: (mugenized by Tenebrous & KoYoTae) https://web-beta.archive.org/web/20081013192407/http://xgargoyle.mgbr.net:80/tenebrous/jedah.zip
=> source here: (mugenized by rei) http://gal129.webcrow.jp/Hosted/hosted.html
=> source here: (mugenized by Deuce & BBH) http://www.trinitymugen.net/forum/index.php?action=tpmod;dl=item102