Karalo Hepoiteloto Maibuca Junior (born 10 June 1999) is a Tuvaluan sprinter. He is the son of Ratu Karalo Maibuca Senior, a Fijian, and a mother from Kioa.^[5] He was selected to compete at the 2020 Summer Olympics^[6] and was given the honour of being the flag bearer for his nation in the opening ceremony alongside Matie Stanley.^[7] In the preliminary round of the 100 metres he ran a Tuvaluan national record time of 11.42 seconds, but did not qualify to the next round.^[8]

Maibuca represented Tuvalu at the Pacific Mini Games in Saipan where he competed in the 100m (11.76 [-2.0]) and the 200m (23.66 [-0.9].^[9]

Maibuca represented Tuvalu at the Gold Coast XXI Commonwealth Games in 2018 and the Birmingham XXII Commonwealth Games in 2022,^[10] where he broke the Tuvalu national record in the 100m with a time of 11.39 [+0.6].^[11] Maibuca competed in the 2023 World Athletics Championships in Budapest, running 11.55 [0.0] in the 100 metres,^[12][13] but failed to progress past the preliminary round.

Maibuca represented Tuvalu in the 2023 Pacific Games:

• In the preliminary heat of the 100 metres, he placed 6th with a time of 11.35 seconds, but not proceed in the competition.^[14]
• In the preliminary heat of the 200 metres, he placed 4th with a time of 23.31 seconds; in the semifinal he placed 7th with a time of 23.66 seconds, but not proceed in the competition.^[15]
• He also ran in the 4 x 100 metre relay with Kanae Saloa Malua, Londoni Tiso and Kaumoana Teaitala. In the preliminary heat the team placed 3rd with a time of 43.56 seconds; in the final the team placed 6th with a time of 43.29 seconds.^[16]