It's complicated, but for a while Jason was able to transform by merging with with anybody. Later he could merge with another person but didn't have to if he wanted to transform. Recently in canon, he requires another person to transform, but his powers are best if its Professor Stein or possibly Firebird or his girlfriend Gehenna.
In these current scans, he is able to transform on his own.
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teekoness) wrote in ![[info]](https://www.insanejournal.com/img/community.gif){kind=small}
scans_daily,