The third one is a patalliro anime parody. xD
せいらこそがニコニコの王子様 - Parody featuring the Pink ranger as Seigaku. Atobe has fro, Jin is a box with his respective kanji. Mizuki and Dan-desu are strange panda hybrids.
ギャグマンガテニミュ2 Parody of many animes, and the song is the remixed version of Gag Manga Biyori 2. It's also based from one of the episodes of Gag manga biyori 2. Mind you, don't watch it unless you get japanese humour. D:
テニスマンガ日和 魔法日吉誕生 - Another Prince of Tennis parody with Gag manga biyori.
ギャグマンガテニミュ(アニメ版) - Last parody from Prince of tennis and Gag manga biyori. Opening also kind of based on Lucky Star. Lyrics are:
There's a demon on the court.
Everyone I know has lifeless eyes.
I wasted my life on SEISHUN tennis. (A pun on the original song.)
You're not my friend. But your friend is my friend or something like that.
GAG MANGA BIYORI! Also, the voice actor for Jirou sang this song.
(Haha. We translated the song for you people. We'll translate the rest later. )
あいつこそが落描きの王子様(125%) - ... A drawing parody? D:
(MAD)おっくせんまん全員Ver + テニミュ 動画再編集 - Parody with a Megaman song. Also has references to X Japan.
I'll get more links later. >_>;;;