Hydrogen rich superluminous supernovae (SLSNe II) is a puzzling class of extremely intrinsically bright events. Their exact powering mechanism is not yet understood. Most SLSNe II show interaction with circumstellar material (CSM). The mechanism that dictates which is the dominant mass loss event (e.g: winds, outbursts, mass ejections) producing CSM in different progenitors is unknown. Systematic analysis of large samples of SLSNe II light curve features could aid to constrain their possible progenitors. In this talk I will present results from the analysis of a sample of SLSNe II light curves from the ZTF survey, focusing on extreme events that may indicate differences in the powering mechanism of this class.