Santa Claus

Santa Claus is a character in Power Rangers and Super Sentai who tends to show up around Christmas season.

Mighty Morphin Power Rangers
The Rangers visited the North Pole to help Santa prepare for Christmas.

Lord Zedd briefly took over Santa's shop the following Christmas, in an attempt to force his elves to make toys that would mind control all the children of the world. The Rangers volunteered to try and stop them, despite their powers not working at the North Pole. They succeeded, and once again helped Santa prepare presents.

Power Rangers Dino Charge
Santa requests the Dino Charge Rangers' help (through Dino Coms) as Poisandra has stolen his computer, detailing those who have been naughty or nice. Poisandra realizes that since it contains odd video following people in various acts, she may be able to ascertain the Rangers' base location. However, she fails when the Rangers find her with her cohorts. When the Rangers manage to get the computer back, Santa repays them by giving Chase Randall a ride to New Zealand on his sleigh, so he doesn't miss Christmas with his family.

GoGo Sentai Boukenger
Satoru Akashi encountered a female version of Santa called Eve.

Engine Sentai Go-Onger
Santa Claus (サンタクロース, Santa Kurōsu) is a being from the Christmas World (クリスマスワールド, Kurisumasu Wārudo), a Braneworld where the holiday season is endless. Using the Different Dimension Present Bag (異次元プレゼント袋, Ijigen Purezento Bukuro) he carries with him, he can take out presents from Christmas World and bring them into other Braneworlds.

Samurai Sentai Shinkenger vs. Go-Onger: GinmakuBang!!
To be added