Blazeborns are elementals. Many elementals do not have a solid form unless they will themselves to, blazeborns being one of them.
When Tango fully relaxes, he tends to desolidify, meaning he has phased through a hammock, and even a bed or chair, once or twice. The rest of ZITS have fallen through him while trying to give him a surprise hug before. He has also forgotten to resolidify when interacting with the other Hermits a few times. This once resulted in him and Jevin somehow merging when attempting a high-five.
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