Kamen Rider Build have most for with the record of 3194 forms, second being OOO with 133 forms(count random and full combo, but exclude ), but If all usable Core Medals of OOO, excluding the imaginary Love Medal and Putotyra, can be used to transform and form Random Combos, the total number of combos will be 4557, meaning that technically, OOO still keeps his record. The reason Love and Putotyra can't be used is that Love is imaginary and Putotyra could possibly form Random Combos, as shown in the OOO Combo Change toys, but due to how powerful and dangerous the medals are and them being fueled by the void of desire rather than desire itself, these medals' powers cannot be used in conjunction with the other Core Medals, to further emphasis this, the Putotyra suit is largely a single piece suit, locking the Tricera and Tyranno parts onto the suit.