Wonder Bowser Jr. - Super Mario Wiki, the Mario encyclopedia

Wonder Bowser Jr. is a form of Bowser Jr. in Super Mario Bros. Wonder. Bowser Jr. can obtain this form from the Wonder power in palaces. Wonder Bowser Jr. is dark blue in color, with green flame-like hair and bright green spikes on his purple and orange shell. Additionally, Bowser Jr.'s bandanna is similar
Wonder Bowser Jr. is a form of Bowser Jr. in Super Mario Bros. Wonder. Bowser Jr. can obtain this form from the Wonder power in palaces. Wonder Bowser Jr. is dark blue in color, with green flame-like hair and bright green spikes on his purple and orange shell. Additionally, Bowser Jr.'s bandanna is similar

Bowser Jr. - Super Mario Wiki, the Mario encyclopedia

Dark Mario (Super Mario Bros. Wonder) - Super Mario Wiki, the Mario encyclopedia

winstein's art that are drawn by him, take a look if you want, Page 2

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So apparently, Larry is the leader of the Koopaling, not Ludwig : r/Mario

Super Mario Bros. 2 (USA), Nintendo