As Buddhists, we take refuge in The Three Treasures: the Buddha, the Dharma, and the Sangha. The first of these, the Buddha, refers to enlightened beings whose life and teachings provide guidance and support to us.
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Wikipedia Links

Amida

 

The Buddha of Infinite Life (Compassion) and Immeasurable Light (Wisdom)

Siddhartha Gautama The historical Buddha (circa 563 to 483 BCE) and the founder of Buddhism. aka Sakyamuni or Shakyamuni.
Shinran Shonin

Shinran 親鸞 (1173 - 1263 CE) was a Japanese Buddhist monk, who was the founder of the Jodo Shinshu (or True Pure Land) sect.

Rennyo Shonin

Rennyo 蓮如 (1415 - 1499 CE) was the 8th Monshu, or head-priest, of the Jodo Shinshu sect and is often referred to as the restorer or second founder of the sect